If I'm not drinking water, I'm just drinking iced green or iced white tea with lemon.
But I've been thinking of switching to something more in line Berardi's PN way of thinking.
Something like white tea or gatorade or vitamin water as a base, with a half serving of whey, some creatine, maybe some BCAAs, and a tsp. of greens powder.
Why greens powder? "If there's protein on the plate, there has to be veggies" (from Berardi's most recent article).