The simplest way to save water is to use machines that are water efficient. Dishwashers, and washing machines come in models that use less water, and many rebates exist to subsidize the cost. Also, about 40% of our in house water use is used to flush toilets. With low flow toilets, we can put a real dent in our water usage, and we can begin to lower our impact on the environment.
Your local utility company may offer rebates to encourage buying water efficient appliances.