What is the most important infrastructure of development?

Water is one of the most important basic elements for all living beings on this earth. About 70% of the human body is made up of water. Human beings can live without food for some time but not without water. Water is used for various purposes, such as for cooking food, washing clothes, bathing, growing crops, construction works and for generating hydro electricity. Water plays a vital role in development of a country. Clean drinking water is necessary for good health. If the citizens are healthy, development of a country will be rapid. Thus, government should make all the efforts to supply pure drinking water to it's citizens.