You may want to start with ...

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You may want to start with clean rain water first. Very large storage tank. Pump for pressure your control.  Most rain water is non pathogenic and free of toxins. But id you wish added safety using an Archaea bio filter.  This will allow you to eliminate the cost of infrastructure.  Most storage systems have a 2 years supply.  This way you can water truck emergency water to a nearby school or district.  Depending on the size of the pump motor monthly electrical usage would be similar to that of a fish aquarium.