This varies for me, during the week just water/juice as if I get wired i don't sleep and then can't work well the next day.

But on the weekends I load up on JOLT (Orange is my fav, but they are all good) or Red Rain (red rain is a red bull clone, but costs $1/can vs 2.50+ a can).

As an aside.. i don't really like drinking (alcohol) and gaming, they don't seem to mix well.  that being said, a video game that could be adapted to a drinking game may be fun, any ideas?  We tried it with Wario Ware once but we would have probably died of alcohol poisoning if we played for more than 30 mins.

As for snacking.

I have yet to find the perfect food for gaming.  Grapes work pretty well, but lack the salty flavour explosion i want (ie, from doritos, potatoe chips etc). Need something that won't leave a residue on hands and controlers, can be eating from a bag, etc.

nothing usually im trying to play the game with both hands

but water or chips i sometimes eat apples or oranges while gaming

Pepsi

alone, anything that doesnt require cutlery (though usualy nothing... I stop to eat )

with friends is the same except with a few beers

Nothing

I absolutely hate when my controllers get dirty.

Back when I was playing WOW, pizza bites was my favorite "raid food". Other than that I dont eat when I game. I usually drink iced tea or an ice cold beer while gaming.

water and fruit usually

No its a bad habit. Bad food/drink will make you fat. Even good food will slow down your gaming or ruin your controller. If I need to eat, I take a nice break and read the newspaper. Its good for you to take a 30 minute break every 2 hours anyway.

pepsi and and doritos but i only eat during breaks

Nothing. If I'm thirsty I just drink whatever there is, but I don't usually snack when I'm playing something.