Some models to look at.

Singapore, for example, is very, very good when it comes to water use. You will not find the phrase wastewater in their terminology. They have only two descriptive to words; clean water that supplies industry and other communities and drinking water.

Water is basically a strategic resource for Singapore, and they treat it as such. Lee Kuan Yew, the first president and founder of Singapore, made water a priority because he basically said water is one of our core strategic issues. They had an approach to water of self-reliance and a drive to become self-sufficient. To make best use of this valuable and finite resource this is the sort of approach you must take pretty much everywhere, because we cannot rely on largely living live off the water that comes off the land and the catchments around the cities and then go on to only use most of the water once.

The UN SDG’s.

Look at the UN Sustainable Development Goals, there is one that is strictly directly focused on drinking water and sanitation, but when you study the 17 goals there is an analysis that says between 12 to 14 of the 17 have either a direct or indirect connection with water.
Without water you cannot have life.