Allah says: 
 Have those who disbelieved not considered that the heavens and the earth were a joined entity, and We separated them and made from water every living thing? Then will they not believe? (21:30)

Modern science affirms clearly that water is the basic building block of life. Chemists have proven that water is a necessary and active substance used in the reactions which occur inside the body. For this reason, it is the only fluid which every living thing needs, no matter how large or small it may be, starting with micro-organisms to the largest living animals on earth.

The main source of life for humans, animals and plants is water. It is proven by scientific analysis that the body of a human adult from the age of 15 years and upwards ranges from approximately 50-75% water. As for a child, their body water composition can be even higher. As for the plant kingdom, the water content of common fruits and vegetables is as follows: banana (74%), white potato (79%), grapes (81%), pineapple (87%), celery (95%) and radish (95%). This shows how all life is based heavily upon water.