You're Not Sick, You're Thirsty by F. Batmanghelidj M.D.
This book is about how the author came to understand the importance of water to the human body. He addresses the issues that make the medical system change or look at their teachings about the importance of water. His findings through hard times and prison on water, showed how we as Americans forget about the things that we need and how that has caused so many issues. Some of the things he's encountered doing research, listening to what other professors say, makes you wonder!