Take a sip if you or someone else accidentally triggers a car alarm.
Take two sips if you or someone else shoots it on purpose.
Finish the glass if all of the alarms are triggered in The Parish's Cemetery level.
Take a sip every time a survivor says "Grabbing Pills!"
Take a sip for every friendly fire incident you suffer from other players. Two sips if it results in a player being down and finish the glass if the friendly fire causes a player to die. Not recommended to try on Expert mode!
Take a sip if you join a team in VS. whose strategy is "Speed Run".
Take another if it fails, as it usually does.
Finish the bottle if it somehow works for once.
Take a sip every time you join a VS. game where you're inevitably on the losing team.
Take another if they're down by over 2000 points.
Take another if they're trying to speed run, on top of the speed run shot above.
Take a sip when you join in a modded server.
Take another if the server's MOTD completely affects your performance.
Take a sip when someone dies. (Easy and Normal recommended)
Take another if it was from a Special Infected. Take three if it's caused by two Specials.
Take four if it was from a Tank and they have Green health at the time.
Down the bottle if the whole team dies by the tank.
Down the bottle if you or someone else is the only one alive in the safe room.
Down another (and pass out) if you're the only one who escaped.