You can save a great deal of water by using water-efficient appliances. When you need to replace your toilet, look for one that uses less water to flush. Check the gallons per flush. Install low-flow faucets and shower heads. Low flow basically sprays less water out but can still maintain a good pressure. Installing an aerator on your existing faucets is cheap and easy. Seek out products with WaterSense certification.
When you buy a dishwasher, check how many gallons it uses for a wash cycle and look for one that uses the least. Seek out Energy Star-certified machines. Another tip to save water when washing dishes is to not rinse the dishes before loading the dishwasher. Just scrape food scraps into the compost and load directly into the dishwasher.
Another side effect of saving water is spending less on your water bill.