Is the water in these collection tanks and cisterns safe for cooking or drinking or dishwashing, clothes washing, and showers, or is this water mostly good for toilets, watering the garden, trees, grass, bushes, and plants?
Conventional toilets use the most water, then clothes washers, showers, faucets, and then leaks, followed by baths, dishwashers, utility sinks, water softener regeneration, evaporative coolers, humidifiers, ice makers, etc.