Want hot water without starting the engine? If you have a 110-volt outlet and a water faucet hose, these 2.5 and 4 gallon portable water heaters will produce it for you.
Spray it on your shower walls (or other surfaces in the head) to prevent mildew, soap film, and mineral deposits.
DRYroll is a watertight toilet roll dispenser for heads that also serve as a shower, wet locker, or changing room.
Water pumps have improved a lot. Products from Groco, Johnson, Flojet, Raritan, Shurflow, Par and Whale are rated for flow-rate, noise, ease of plumbing and compact size. 6 pages with photos, table of specs and test results, and vendor list.
Here are some shortcuts to keeping your hair, skin, and teeth clean, with comments on showering alternatives.