Collecting and Harvesting Rainwater
Drinking water (also known as "potable water") is water that is safe to drink. Many countries impose strict standards governing the quality and purity of drinking water. A great deal of effort goes into processing, transporting and storing water so as to ensure that people have access to a sufficient quantity of high-quality drinking water. This not only costs money, but also consumes a great deal of energy and untreated water.
Structure of a rainwater harvesting system
The following picture shows a family home with rainwater harvesting system. Besides the cistern, it's components are: Rainwater filter, smoothing inlet, floating suction filter and rainwater plant. The clear water is used for toilet flushing, garden irrigation, in the washing machine and for cleaning.
Proceed reading here, if you want to learn more about the great possibilities to use rainwater in your home.