Or tank (rain) water. Living on tank, you have free water unless you run out, when it is hideously expensive to truck it in. But as long as you have your cons

Or tank (rain) water. Living on tank, you have free water unless you run out, when it is hideously expensive to truck it in. But as long as you have your consumption under control, you are your own water company and you may choose not to bother with appliances that focus on water efficiency.