If you have a non conserving toilet (a 3.5 gallon flush or greater), retrofit the toilet with a water-saving device. There are several options that you can discuss with your local hardware professional, but an easy and quick fix involves placing one or two weighted bottles in the toilet tank to displace water flushed. Fill one-quart plastic beverage bottles with water for each non conserving toilet in your home, and submerge first one, then two if necessary, inside each toilet tank. With each flush you will save water equal to the amount you've displaced, and thousands of gallons a year. Note: Be sure the bottle does not interfere with the operating parts.