Hmmm, gaming beverage choices can be amusing. I generally stay away from Coke, even though I love it, because gaming gets me wired already -- I generally can't sleep until 2-3 am after gaming as it is! Lamely, I tend to drink Diet rootbeer -- which has no nothing in it. Sometimes I'll go with Newcastle Brown Ale or Strongbow Cider . . . British stuff seems more medieval to me.
One of my fellow gamers likes to do about a six-pack of Rainer (local Washington State lager, not as good as Bud IMHO), another likes ridiculous quantities of Mountain Dew (like 40 oz.), but most are a reasonable mix of decent beers and soda.
As we've gotten older, we've moved from pizza and chips to carrot sticks and what we call "Scooby snacks" (a type of health food oat cereal). Once in a while, we'll go with Iron Rations -- Oberto beef jerky, Carr's Water crackers (close as you can get to hardtack), and dried fruit. Yummy!