Water lubricates your joints. Drinking lots of water increases the volume of synovial fluid, the liquid that allows bones to glide against each other with little friction. Water cools your body. Perspiration is the body's way of cooling you down. Water, especially cold water, helps your body maintain correct temperature.
Water helps head off wrinkles.
Good skin tone is dependent on elasticity, which water promotes. Water carries waste out of your body. Your kidneys, the recyclers of blood, need lots of water to do their job well. Water prevents kidney stones. When the kidneys don't get enough water, salts may crystallize, forming painful stones.