Water is a source of life because 70% of our body contains water in it. Lack of water in body will cause many disease and problems. if there will be no water we will have to face ,any problems. Water is essential for every part of the body. Our blood is fluid because it contain water. It is fluid so it can rotate properly throughout the body and if there will be less water blood will also not able to flow properly. that's why it is said that water is a source of life.