Bucket loads of tea and coffee throughout the day and evening. Occaisional glass of water at work just to rinse the fur off my tongue (manky fake coffee). Find water on its tod a bit dull, the touch of fruit ones are nice, though probably full of sugar.
I asked someone at work about water once as they got through bottles of the stuff. Apparantly you get used to it and don't need to keep going to the loo as your body absorbs it, or something like that. She did say it takes a while though and early on she was always dashing to and fro.