Especially tea, but bottom line, more in means more out. Water works just fine too, and most people don't get enough anyway.
Yeah coffee for sure, also beer seems to produce a lot of output, though that should only be utilized by people of legal drinking age.
Coffee ...basically Caffiene
Iced tea does the trick for me! Goes right through me.
Peachy
A couple light beers should have you going in no time... for a long time =)