Drink: Water, Ice Tea, Soda.
Food: Candy, Microwave stuff, Chips.
The rest of your post says otherwise...I rarely eat snacks while gaming, I prefer to eat a proper meal beforehand. And then I will drink whatever is the most tempting at the time, be it water, tea, soda or whatever.
Oh god the horror, I could never eat such crap. It tastes horrible, looks disgusting and ofc lack any sort of proper nutritional value. And is full of salt and god forbid what.
People eat that crap? :P