With less than 3 percent of the Earth’s water available for human consumption, why would you ever wash your car or water your lawn with scarce drinking water? Consider using rainwater runoff from your roof that’s collected in an above-ground cistern like the Slimline from Bushman, a company in drought-plagued Australia. You can set up a system complete with connectors, filters, and even a pressure pump without digging up the yard. Made from a single piece of roto-molded polyethylene, Bushman offers slim- and low-profile round-tank designs in sizes from 130 gallons to 2,825 gallons.
Starting price: About $500; Bushman