After breathing air the most important thing needed most is water. Water is an essential commodity for the existence of life on Earth. Nowadays we know the miserable situation occurs when rainfall will be less. If rainwater decrease means the water content will be reduced. We need water to fulfill our unavoidable needs. We need water to drink, to cook food, for bath, for washing clothes, for cleaning home. For all our needs we need water. Did you think about the situation in which their is no one drop of water in the world? How frightening it will be. Hence we needed to conserve every one drop of water.