Cartilage is 85 percent water. Water keeps the cartilage around our joints hydrated and supple, ensuring that our joints stay lubricated. It also protects our spinal cord and tissues, keeping us healthy Water powers nearly every process in the bodyfrom mood and muscle function to metabolism and clear, healthy skin. Drinking enough each day helps flush out waste, keeps your joints comfortable, and supports Why Drinking Water Is Good For Your Joints Optimum Health Rehab Hydration and Performance: Why Fluid Intake Matters