I play the CC at the time after work, so I like to drink coffee during the game (sometimes I add Marie Brizard or Irish whiskey to the coffee nut). I do not like snacks.
At all, not only while poker also for other occasions and games in the evening, I like potatoe chips and nuts and so on. More salty stuff, than sweets.
Accompaning I like either a beer or some tea. Always depending what game I play and what to do at next day.
I always eat a normal dinner before the poker session (hot dogs or small pizzas most often). When I play, I drink water with juice every hour and cappuccino coffee.
Generally, I prefer some fruit and or fresh veggies, plain water or coffee.
Anything more and I start slipping into a post-prandial coma. Depending on the intensity of my momentary tilt, this is a blessing or a curse.
But I am a BIG fan of molecular consumption - ideally not something so heavy it takes me down to sleep town where I just say 'Forget the game, I am going to sleep'