This original six chapter book will briefly review and integrate the basic concepts behind water distribution and movement in the body. This fills a knowledge gap that most medical and undergraduate physiology students acquire when these topics are studied separately. As of now, there is no textbook that fully integrates renal, cardiovascular and water physiology in a clear understandable manner. The book is intended primarily for medical students and undergraduate physiology students. Chapters include: 1) Water and its Distribution; 2) Water Dynamics; 3) Fluid Handling by the Heart and Blood Vessels; 4) Fluid Handling by the Kidneys; 5) Water and Oxygen Delivery; 6) Integration in the Response to Hemorrhage, Volume Depletion, and Water Redistribution.