VIDEOS:
Water Kirby
The Water ability made its debut in episode 97 of the Kirby anime, and his primary method of attack is spewing a geyser from his mouth, as demonstrated here. It eventually made its way into the games starting with Kirby's Return to Dream Land.
Example of:
Making a Splash
Kirby and the Forgotten Land
Example of:
Water-Geyser Volley