Installing Low Flow Plumbing Fixtures
If you haven't already upgraded to low flow water fixtures in your home, you could be using up to twice the water you need to. Changing out an old 3.5 or 5 gallon per flush toilet with the new 1.6 gallon versions can virtually cut use in half all on its own. A new toilet isn't cost prohibitive and it won't take more than half an hour for a pro to install.
Toilets aren't the only place that water can be saved. Shower heads are some of the worst water wasters, often using 5 or more gallons of water a minute. Take a fifteen minute shower and you've just gone through 75 gallons of water. A low flow shower head would use half that so you could take twice as many showers if you wanted to.
As if these two fixes weren't enough, adding aerators to your existing faucets can cut down water use at each up to 25 percent. These parts cost about $10 a piece and are available at your local hardware store.