The PolyJohn Enterprises Water Works freshwater delivery system uses an on-demand electrical pump to deliver up to 93 gallons of freshwater whenever it’s needed. A semitransparent tank allows users to see how much water is available. An auxiliary holding tank can be added to double the capacity. The system weighs only 46 pounds empty, making transport a one-person job. It measures 60 inches high and 23 inches wide and fits nicely inside a small closet. The system can also be plumbed to fill from the outside of a trailer. For graywater storage, 250- or 300-gallon tanks are available. Cleaning the inside of the tank is easy because of the 10-inch-diameter access cover on top, and water can be drained quickly through a 1-inch valve. It is designed to operate on regular household current, and the circuits are protected by GFCI and a low-water electrical shut-off. 800/292-1305; www.polyjohn.com.