Ive read a couple of books just on water. Ive drank nothing but distilled for over 15 years. Ive mentioned this in another thread but in a book entitled your body's many cries for water it talks about how your cells reject water from pop, coffee, tea, etc etc. Pop and coffee actually DEHYDRATE you. This book will answer any question you have about water. Its was written after a ten year research on the effects of water and how it works not only to hydrate you but keep you from many diseases.
Absolutely. Caffeine based drinks are detrimental to your overall gain of H2O. There was a raging debate about this a while ago (few years?), and a Cafe member who was a physician made a point about distilled water being better, because tap water contains too many carcinogens. I laughed and told him that with all the other problems I face that are life threatening, I'll take my chances with spring or tap water. Distilled just tastes weird to me.