Theory:

Facts about water
Water is one of the most important substances for the survival of living organisms. One can survive without food, but it is impossible to survive without water.
In order to bring awareness among the people about the importance of water, the 22 March is celebrated as World Water Day. It is celebrated so that the attention of everyone is attracted towards the conservation of water and its importance.
 
"Jai Hai, To Kal Hai" is a slogan that means, "If you have water you can think of future", .i.e., no life is possible.
 
Water is considered precious, as it is a limited resource. 2003 was called as the International year of freshwater so that awareness is brought among the people regarding the importance of water as a resource and its faster depletion.
The United Nations recommended 50 litres of water which equals two and a half buckets per person for drinking, washing, cooking and maintaining proper hygiene per day.
 
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But most of the people do not get this amount. The shortage of water has become a matter of concern all over the world.
 
Important!
On a rough estimation, it has been stated that one-third people of the entire world may face a problem of water scarcity in a few years from now.
Availability of water
Our planet earth is abundant with water. About two-thirds or 71% of the Earth is covered with water.
Earth is known as the water planet or blue planet
 
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About 97% of the water is found in the form of sea and oceans which have many dissolved salts making the water saline. The other forms include ice caps, glaciers and underground water. The underground, rivers and lakes are the sources of freshwater. The water that can be used by us is only 0.006% of all the water found on the earth.