WATER is LIFE! The Human Body is composed of up to 60% water! The Human brain and heart are composed of 73% water and lungs are about 83% water. Human skin contains 64% water while muscles and kidneys are 79% water. Even Human bones are 31% watery. So, for a Human Being, water IS life! Drinking a glass of purified water from a reverse osmosis faucet helps replenish the body of water lost by urination, perspiration and evaporation. Drinking up to 2 quarts of water per day keeps the body healthy. Enjoy!