Coke, diet coke, sprite, diet sprite (that's not at every station, I remember it being at the one right next to the door), filtered water, nestea or some other premade brand of iced tea (sweet and unsweet), fruit punch, lemonade, and Mr. Pibb (I think it was Mr. Pibb - something like that). There's regular and decaf coffee, and hot water (tea bags - herbal and regular, and hot chocolate mix provided).
There was no button to just get soda water. I noticed, because soda water is one of my diet drinks of choice. I was able to get soda water with lime free in the dining rooms. Never asked at Topsiders. The main dining rooms charged for tonic water. Palo's didn't.
Hope this helps.