There's a lot of diet soda at our table. I tend to bring two-liters of Coke, random grape soda, or Sierra Mist (don't like Pepsi, and Sprite gives me hiccups). I will occasionally bring a 20-oz of Mountain Dew along for me. One of the less-regulars loves it when I bring along Caffeine-Free Coke, though that's sufficiently rare that it's hard for me to bring.
No booze at the table, mostly because none of us really drink. Besides, when the Can't Booze DM is going, you want all your faculties about you.
Brad