I don't like most fizzy drinks, so I don't drink Coke, Pepsi, or anything else like that (I can drink Dr. Pepper if it is one of the only things available, but it's not my first choice). I prefer water, sweet tea (really sweet), lemonade, or milk. Oh, and orange juice.
Hot chocolate is good in the winter.
I can drink coffee and tea if I have a lot of sugar or honey available as well.