I like soda water and super light beer like Budweiser select. They both have carbonation and the beer is about 3% so it won't get you drunk untill you have had enough to get a good round belly.
A bit of juice watered down is great when you can't handle any more bubbles.
Though not a liquid, pudding is a good thing to binge on. I've enjoyed stuffing with rice pudding since it is very easy to make and its consistency makes it perfect for shovelling in your face. It is very calorific and helps stretch the stomach.
It goes down very easily and is very satisfying way to cap off a day long binge.
