Functions of Water: 7 Health Benefits The water in you: What water does for your body U.S. Geological Survey Digestion of Food and the Absorption of Nutrients The Medical Biochemistry Page Our bodies are basically walking oceans we're made of nearly 80% water! Every cell, every tissue, and every organ depends on it to keep things running smoothly. That's why giving your Water and hydration: Physiological basis in adults Hydration for Health