Local water cycle
Physiological Need - Fresh Water

Solution

I have thought on a solution, which is inspired from natural hydrological cycle. It is based on solar evaporation.In this waste water can be collected and then heated using solar energy. In this process water molecules will evaporate and then they can be condensed (similar to distillation process). This will separate water from all the chemical and organic impurities. Idea needs to be worked upon, it is feasible & it can produce sustainable local water cycles.