Water is a very important nutrient that is often taken for granted. The body's need for water is only second to that of oxygen. You could live for weeks without food but only a few days without water.
Water is absolutely critical to life.
They would not be able to function without water. The quantity of water in the body varies with the body fat. Fluids within the cells make up about three fourths of the total body water and the rest is found in the circulating plasma and as interstitial fluid, that is lymph and fluid which washes the tissues. The circulating plasma is about 5 per cent of the total body weight. Water is a chemical compound of hydrogen and oxygen.