Water covers approximately two-thirds of the planet’s surface. Most of it is far too salty to use. Less than 3% of the water on Earth is suitable for use and about two-thirds of that is contained in the world’s icecaps and glaciers. Therefore about 1% of all the water on the planet is suitable for consumption and sanitation.
Obviously,the amount of safe water in the world is limited and according to charity: water a billion people (approx. 1 in 8 ) have no access to clean drinking water.