Water is one of the most important and vital substance on earth. All life forms on earth require water to survive. If there will be no water there would be no life on earth. Aside from drinking water to survive, people have many other uses for water.
An organism which does not require water is never discovered. While some organisms require less water than others, e.g., cyanobacteria Chroococcidiopsis, for instance, requires minute quantity of water that biologists even think it may be able to survive on the arid surface of Mars. Every organism that is alive needs water to survive. In fact, without water, life on Earth would never have started. Water is also one of the reasons that there is no life on any other planet in the solar system.
Directly or indirectly water has an effect on all the life forms inhabiting Earth. Vegetation is impossible without water, as we know plants need water for replenishment. On the same hand, both animals and humans also drink water, which is a major need of their bodies, without water they will loss normal functioning of body cells as boy cells require water, also its deficiency leaves the body dehydrated.
Shortage or loss of water is a major threat to life sustainability on planet earth. Water provides the Earth with the capacity of supporting life.

Importance of water in humans
In humans, water acts both as a solvent and a delivery mechanism, it dissolves essential vitamins and nutrients from food and delivers them to cells. Our bodies