Usually Sprite/Sierra Mist/7UP, etc. Most recently though, I had lost my water bottle in the terminal and didn't realize how dehydrated I was, so I got two cups of water, then asked for a 1-liter bottle of water, which she gave to me, after serving the filtered water to other guests, then refilling with tap water. (Not that I was angry or anything, I'm glad I got it). I don't think should would have given it to me if I had been able to fully speak, which I wasn't. "Could I have one of those big bhhhhot-cough-inhale-hottles of water?" 
WEIRD though- EVERYONE around me got tomato juice. Every order I heard around me was either tomato juice or a bloody mary. Oprah must have said something good about eating tomatoes the day before.