* low-flow shower heads; short showers instead of baths (about $5)
* faucet aerators (about $1 or $2 each) to restrict water flow on sinks.
* run your dishwasher full (and/or replace with a water-conserving model) and without rinsing dirty dishes (scrape them off into the compost or trash).
* run only full loads in your clotheswasher (and/or replace with a water-conserving model)
* don't water your lawn for a while, or minimally water it, or install drip irrigation.
* cache rainwater to water your yard or use greywater to water your yard.
* drip irrigate your garden instead of using a hose or sprinker.
* low-flow toilets (new models use 1.6 gallons per flush).