The human body is a bit more than 70 percent water. We need about two litres of water a day to keep us healthy. Water is essential not only for survival but also for what it contributes to the quality of our lives. Many people think it makes no difference how much water we use or what we use it for. But it does.
Water is a finite resource.
Worse still, most uses actually lower the quality of the water. Wastewater treatment and purification processes can't completely restore water to its original quality, so use water wisely. Water is simple and complex at the same time. Pure water has no taste, no colour, no smell, turns to a solid at 0 degrees C and to a vapour at 100 degrees C. All living things, from the tiniest insect to the tallest tree, need water to survive. There are a number of theories that try to explain where water came from.