Anything with a lot of sugar or salt or both will make edema much worse... and if your kidneys are already strained, it will make it a whole lot worse.
Fresh, clear water. Boiled if you like it that way, with ice if you don't. It's imbalanced mineral salts (and sometimes high blood pressure --good idea to get that checked as soon as possible, because of the damage it does to kidneys, too) and drinking a lot more water will help faster than anything else (non prescription). Diuretics (prescription meds) can help, but have a lot of nasty side effects you'd probably prefer to avoid if you can.
at 4:48 AM on Jan. 2, 2011