I used to drink Diet Dr. Pepper or iced tea almost exclusively, and very seldom drank just plain water. But then I had a kidney stone. That was the most painful thing I have ever experienced, and was even worse than childbirth! The stone got stuck and I ended up having to have surgery to get it out. So, now I drink lots and lots and lots of water. I still drink lots of iced tea too, year round, and an occasional soda.