Instead of abrasive cleaners use half a lemon in Borax. Instead of disinfectants use half cup Borax in one gallon of water. Instead of drain cleaners use half cup of baking soda and quarter cup of vinegar in boiling water. A heated waterbed can use as much energy as a large refrigerator. Leaving it unmade in the fall or winter can double that by letting the heat dissipate into the air.
Evaporation can be a major source of heat loss from hot tubs.
Then the water has to be beated again. Water pumping is one of the largest uses of electricity in the arid Western states. So every drop of water we conserve also saves electricity. Between 15 and 30 percent of the energy your water heater uses goes to keeping a tank of water hot, just in case you need it. Turn off the water faucet when brushing you teeth.