I can drain a 1.5L bottle (53fOz?) of Diet Coke while gaming and not go to the bathroom once!
so i guess my vote is Soda.
can remember when EQ came out, took the day off and was one of the few who didn't get punted all the time. Started at noonish and didn't eat or drink, just played, one of the really rare "wow this is the shit" gaming moments, so immersed (yes it was pretty awesome back then, dont let how badly its aged fool you). I can remember finally looking up at the clock thinking welp, played a few hours need some food and drink, it was 18 hours later..Never had that happen again, some great games, but to a RPG addict it was about as great a game (at that time) as i had ever seen. I would love to feel that way about a game again, some are close, but i think that was a once in a lifetime..
but where was Whisky on that list?