History Main / InstantMassJustAddWater

** In another short "I Gopher You", the gopher twins see all the produce in the farm they live under sent to a food-processing plant. One of them falls into a dehydrator machine, which produces meals in tiny packets. The other uses water to rehydrate him, no worse for wear, on a platter with an apple in his mouth.

** "Hut, Sut, Raw" had Rocko, Heffer, and Filbert go on a camping trip. At one point, Rocko takes out of bag of [[MindScrew "Instant Fire" with the instructions "Just Add Water!"]]

** An alien race from the Andromeda galaxy (the Kelvans) has the ability to "distill" people by using a device on their belts, reducing them down to a porous, softball-sized cuboctahedron. (Water not needed for restoration.)
** Subverted in another episode, when an entire starship crew (except her captain) is dehydrated and crystallized by an unknown pathogen on a planet they visited. The process is shown to be very painful and irreversibly fatal.

* The instant food in ''Film/TheFifthElement'', which has to be parodying this trope -- Leeloo grabs what looks like a pepper shaker, off-screen something small is heard rolling into the bowl, and after a few seconds in a microwave, it has become an entire roast chicken with vegetables.

* In ''Literature/EdenGreen'' and sequel ''Literature/NewNight'', humans infected with an alien needle symbiote are able to regrow entire parts of their bodies after disastrous injuries, a process that uses mostly water as raw material.
* In Creator/RobertAHeinlein's short story "Literature/MagicInc", based in a {{Magitek}} AlternateHistory, someone comes up with the idea of using magic to make a tiny raincoat you can keep in a pen sided holder that grows to full size when it gets wet. The protagonist realizes that you could create a huge industry of all kinds of camping supplies or just anything that you want to carry small that you can just add water to make it full sized.

* Parodied, like many things, in ''Series/{{Batman|1966}}''. When Bruce and Dick are trapped in a greenhouse with just a glass of water each, Bruce pulls out instant costume capsules. After dropping one in each glass and they just needed to wait a few minutes for two fully loaded costume to hydrate.

* Creator/{{Chaosium}}'s ''TabletopGame/{{Stormbringer}}'' supplement ''Stormbringer Companion''. When placed in water, a waterhorse wafer will swell up and become a full sized waterhorse (a demon from the Plane of Probability.

* The dehydrated food also appear in the ''WesternAnimation/BackToTheFuture'' animated series, where Verne would be bullied for lunch money, admit that he only has the pills, which the bullies then knock out of his hand and when they hit the wet ground they pop into a full-turkey dinner.

** In "Schnit-Heads," at the Sausage Works, new employee/cult member Heffer is served some kind of powdered mass for lunch. The cafeteria worker initally jokes it's dirt, and then reveals it's really powdered sausage: just add water! So he pours some water onto the powder and it instantly turns into regular sausage links. Naturally, Heffer thinks it's cool.

* Subverted and mocked in ''WesternAnimation/TheSimpsons'' episode "[[Recap/TheSimpsonsS7E4BartSellsHisSoul Bart Sells His Soul]]": Bart uses the five dollar he got for his soul to buy dinosaur shaped sponges which the page advertises as growing gigantic when made wet. Bart imagines them growing into large dinosaur sized sponges which then frighten Lisa. What he gets is a pair of sponges that [[SurprisinglyRealisticOutcome get slightly bigger and then get washed by the hose down the sewer drain]].

* ''WebAnimation/ElainTheBountyHunter'': In the episode "Elain Gets Adopted", Elain keeps a bag of dehydrated ''guns'' on her, which comes in handy when she learns her new "owner" is a wanted man.

* More than one ''Anime/{{Doraemon}}'' gadget has displayed this ability, where upon being dabbled with water, the item in question (usually appearing in the form of powder or FoodPills) will turn into a glorious feast. These usually shows up in ''Manga/DoraemonsLongTales'' when Doraemon and friends have to spend extended amount of times in the wilderness or outdoors.

* An episode of ''WesternAnimation/ChipNDaleRescueRangers'' has Monterey Jack unwittingly swallow a piece of "dehydrated cheese" while aboard a space shuttle. It immediately inflates to full size, comically turning Monty into a large brick shape.

* ''Wiki/SCPFoundation'', [[http://www.scp-wiki.net/scp-1122 SCP-1122 ("The House of Tomorrow")]]. The house's kitchen has FoodPills that change into three-course meals when water is added to them.

In a way it's connected to the tendency in sci-fi for large, complex objects to [[ImpossiblyCompactFolding fold or retract into small ones]], such as [[WesternAnimation/TheJetsons George Jetson's]] car turning into a suitcase, those vanishing animal-head masks in ''Series/StargateSG1'', or the capsule items in ''Franchise/{{Dragonball}}''. In all of these cases, the shrunken item is easily carried, implying all that mass actually went somewhere else. At the very least, there's an overarching trope here -- the idea that if you make an object smaller, it magically [[HollywoodDensity gets lighter too]].

Dehydration is a wonderful thing in fiction! It can make anything from creatures to base elements shrink to a easily portable size, and all you need to do to return it to the way it was before is to put a drop of water on it!

In a way it's connected to the tendency in sci-fi for large, complex objects to [[ImpossiblyCompactFolding fold or retract into small ones]], such as [[WesternAnimation/TheJetsons George Jetson's]] car turning into a suitcase, those vanishing animal-head masks in ''Series/StargateSG1'', or the capsule items in ''Franchise/{{Dragonball}}''. In all of these cases, the shrunken item is easily carried, implying all that mass actually went somewhere else. At the very least, there's an overarching trope here- the idea that if you make an object smaller, it magically [[HollywoodDensity gets lighter too]].

* In the film adaptation of ''Anime/{{Blame}}'', Killy is invited into a settlement that is running out of food. He hands over some rations; 1 king-sized candy bar + 20 gallons of water = 8 cubic feet of spongy "food".
* In the manga-only final story arc of ''Manga/RanmaOneHalf'' Akane grabs hold of a magical heat-producing staff which instantly boils all of the water out of her body, but rather than turning her into a desiccated mummy it turns her into a 6 inch tall doll. To bring her back to life (and normal size) Ranma has to soak the doll in some magical water.

* WesternAnimation/{{Megamind}}'s dehydration ray, which is impossibly harmless. If you get hit with it, you get turned into a small perfect cube (presumably equivalent to the mass of you that isn't water, although we never see what happens to the water), and then as soon as that cube gets slightly damp it transforms back into a perfectly healthy human being.
** And he uses it on ''everything''. Stray cats, bags of garbage, Minion, ''[[spoiler: himself]]''...

** They also appear in the ''WesternAnimation/BackToTheFuture'' animated series, where Verne would be bullied for lunch money, admit that he only had the pills, which the bullies then knocked out of his hand and when they hit the wet ground they popped into a full turkey dinner.
* The instant food in ''Film/TheFifthElement'', which has to be parodying this trope - Leeloo grabs what looks like a pepper shaker, off-screen something small is heard rolling into the bowl, and after a few seconds in a microwave, it has become an entire roast chicken with vegetables.
* The 60's ''Film/BatmanTheMovie'' where all the diplomats got dehydrated. Each of them was reduced to a test tube of powder, which didn't appear to be abnormally heavy. They just added water to the powder to return them to normal (Unless you used heavy water... then the results were not so good...)
** The 60's Batman series also featured "instant costume capsules" in one episode. Drop the capsule into a cup of hot water, and it expands into a full sized Bat suit.
* ''Film/SpyKids1'' had packets that expanded into Big Macs in a split second after being placed in a microwave-like "rehydrator".
* ''Film/TheForceAwakens'' has ration packets that contain a powdery substance. Drop the powder in a bowl, add a little water, and in seconds it becomes a big, round, muffin-thing.

* In Creator/RobertAHeinlein's short story ''Literature/MagicInc.'', based in a {{Magitek}} AlternateHistory, someone comes up with the idea of using magic to make a tiny raincoat you can keep in a pen sided holder that grows to full size when it gets wet. The protagonist realizes that you could create a huge industry of all kinds of camping supplies or just anything that you want to carry small that you can just add water to make it full sized.

* In the episode of ''Series/KenanAndKel'' set in the year 3000, the characters buy all of their food in tablet form. When they add water to the tablets, they turn into the actual food.
* Parodied, like many things, in ''Series/Batman1966''. When Bruce and Dick are trapped in a greenhouse with just a glass of water each, Bruce pulls out instant costume capsules. After dropping one in each glass and they just needed to wait a few minutes for two fully loaded costume to hydrate.

* ''TabletopGame/DungeonsAndDragons''. ''Magazine/DragonMagazine'' #73 had the Pill of Plentiful Water. Just add a tiny amount of water to it and it would expand and become a gallon of water.

[[folder:Web Original]]
* ''Wiki/SCPFoundation'', [[http://www.scp-wiki.net/scp-1122 SCP-1122 ("The House of Tomorrow")]]. The house's kitchen has FoodPills that change into three-course meals when water is added to them.
[[/folder]]

* Subverted and mocked in ''WesternAnimation/TheSimpsons'' episode "[[Recap/TheSimpsonsS7E4BartSellsHisSoul Bart Sells His Soul]]": Bart uses the five dollar he got for his soul to buy dinosaur shaped sponges which the page advertises as growing gigantic when made wet. Bart imagines them growing into large dinosaur sized sponges which then frighten Lisa. What he gets is a pair of sponges that [[SurprisinglyRealisticOutcome get slightly bigger and then get washed by the hose down the sewer drain]].

* In the ''WesternAnimation/FamilyGuy'' episode "Das Boom", the Griffin family are living in the [[MillenniumBug [=Y2K=]]] Apocalypse, causing Peter and Lois have this conversation...

''(Peter drinks a glass of water and his body immediately expands to several times its size, smashing the chair he's sitting on.)''\\

* In ''WesternAnimation/RenAndStimpy'' Ren ingests a pill labelled "Cowboy's Delight Dinner". It rehydrates inside him as a whole horse.
--->'''Mr. Horse:''' No sir, I don't like it.
** The episode "House of Next Tuesday" features a dehydrated bed. Then Stimpy pees on it...

** In the ''WesternAnimation/WileECoyoteAndTheRoadRunner'' cartoon "WesternAnimation/ScrambledAches," Wile E. Coyote uses Acme Dehydrated Boulders, carrying a box to the edge of a cliff. One drop of [=H2O=] from an eye-dropper, lift expanded boulder high above head, and SurprisinglyRealisticOutcome.
** In the short "WesternAnimation/{{Hare-way to the Stars}}", Marvin deploys Instant Martians from a gumball dispenser. Bugs later takes it with him to Earth and it accidentally falls down a sewer.
-->Run for the hills, folks, or you'll be up to your armpits in Martians!

* Played straight in an episode of ''WesternAnimation/WhatsNewScoobyDoo'' where melons and other foods are dehydrated to tiny sized, and spring back to normal in a pool.
* ''WesternAnimation/SpongebobSquarepants'': In "Tee at the Treedome", Spongebob and Patrick shrivel up to a dried-up starfish and kitchen sponge, and are restored by pouring water over them. The same thing happens again in ''WesternAnimation/TheSpongebobSquarepantsMovie'' when the two go to Shell City, with a fire sprinkler rehydrating them and all the other dried sea life.
* In ''WesternAnimation/LiloAndStitchTheSeries'', all the experiment pods, golf-ball sized colored balls, are activated by water, turning into life forms of various size. In one episode, a fruit dehydrator allows for the ''re-dehydration'' of one particularly irredeemable experiment.
* ''{{WesternAnimation/Futurama}}''
** Parodied when [[TooDumbToLive Fry]] chokes on a dehydrated tent by eating it in pill form and drinking some water.
** A swimming pool in "Crimes of the Hot" is filled with ''Dehydrated Water'' (Dead leaves and chlorine included). Just throw a cup of water and the pool fills up!

* In the ''WesternAnimation/AdventuresOfSonicTheHedgehog'' episode, "Musta Been a Beautiful Baby", Tails eats some dehydrated food at a factory, then drinks a glass of water. This results in him becoming massively obese. When Sonic tries to get them away from Scratch and Grounder, Tails' massive size gets him stuck in the doorway.
* ''WesternAnimation/RockosModernLife'':
** "Hut, Sut, Raw" had Rocko, Heffer, and Filbert go on a camping trip. At one point, Rocko takes out of bag of [[MindScrew "Instant Fire" with the instructions "Just Add Water!"]]
** In "Schnit-Heads," at the Sausage Works, new employee/cult member Heffer is served some kind of powdered mass for lunch. The cafeteria worker initally jokes it's dirt, and then reveals it's really powdered sausage: just add water! So he pours some water onto the powder and it instantly turns into regular sausage links. Naturally, Heffer thinks it's cool.
** In "Future Schlock", after returning from a trip to outer space, having apparently not aged in that time, Rocko and Heffer are getting used to what is, from their perspective, the future. Heffer loves it.
--->'''Heffer:''' I love the future.\\
''[adds a drop of water to a pill that instantly becomes a huge sandwich]''\\
'''Heffer:''' I love the future!
* In the ''WesternAnimation/TaleSpin'' episode, "Mommy For a Day", Molly finds an Inkara, a tiny mythical creature that grows massively in size when it gets wet. Molly befriends the Inkara, naming him "Henry" and protecting him from [=MacKnee=], a bounty hunter who is trying to capture and sell him.

There is an element of TruthInTelevision to this trope, at least as far as foodstuffs with a high water content go, as water actually is quite dense. A 1m x 1m x 1m cube of water weighs in at a metric tonne[[note]]Allowing for some variation based on the water's temperature[[/note]] so if you can remove the water from a foodstuff you can remove a significant chunk of its mass. The reconstituted product you get from adding the water back is rarely remotely as palatable as the pre-dehydration product was (though some fruits make quite enjoyable snacks as dried fruit).

* Subverted and mocked in ''WesternAnimation/TheSimpsons'' episode " [[Recap/TheSimpsonsS7E4BartSellsHisSoul Bart Sells His Soul]]": Bart uses the five dollar he got for his soul to buy dinosaur shaped sponges which the page advertises as growing gigantic when made wet. Bart imagines them growing into large dinosaur sized sponges which then frighten Lisa. What he gets is a pair of sponges that [[SurprisinglyRealisticOutcome get slightly bigger and then get washed by the hose down the sewer drain]].

* WesternAnimation/{{Megamind}}'s dehydration ray, which is impossibly harmless. If you get hit with it, you get turned into a small perfect cube (presumably equivalent to the mass of you that isn't water, although we never see what happens to the water), and then as soon as that cube gets slightly damp it transforms back into a perfect healthy human being.

* Subverted and mocked in ''WesternAnimation/TheSimpsons'' episode " [[Recap/TheSimpsonsS7E4BartSellsHisSoul Bart Sells His Soul]]": Bart uses the five dollar he got for his soul to buy dinosaur shaped sponges which the page advertises as growing gigantic when made wet. Bart imagines them growing into large dinosaur sized sponges which then frighten Lisa. What he gets is a pair of sponges that [[RealityEnsues get slightly bigger and then get washed by the hose down the sewer drain]].

** In the ''WesternAnimation/WileECoyoteAndTheRoadRunner'' cartoon "WesternAnimation/ScrambledAches," Wile E. Coyote uses Acme Dehydrated Boulders, carrying a box to the edge of a cliff. One drop of [=H2O=] from an eye-dropper, lift expanded boulder high above head, and RealityEnsues.

** In the ''WesternAnimation/WileECoyoteAndTheRoadRunner'' cartoon "WesternAnimation/ScrambledAches," Wile E. Coyote uses Acme Dehydrated Boulders, carrying a box to the edge of a cliff. One drop of [=H2O=] from an eye-dropper, lift expanded boulder high above head, and RealtyEnsues.

Perhaps writers used to have a lot of those expansive sponges or they're very familiar with the factoid that a person is 70% water (a house is seventy percent bricks but try throwing some bricks at some concrete, metal poles and some roofing tiles). However the origin seems to be connected to FoodPills and the idea of astronaut food. Sailors, soldiers and astronauts have needed easily transportable, highly nutritious and long lasting ways of cooking and storing food (and in the case of astronauts, something you can eat in zero gravity), when trying to think of what might be useful for life [[AC:In Space!]], something like this trope turns up.

** In the ''WesternAnimation/WileECoyoteAndTheRoadRunner'' cartoon "Scrambled Aches," Wile E. Coyote uses Acme Dehydrated Boulders, carrying a box to the edge of a cliff. One drop of [=H2O=] from an eye-dropper, lift boulder high above head, and HilarityEnsues.