Want to save money on your water bill? Here's how one family does it: They flush their toilets less . . . once in two days. They also share the same bathwater. Real bad, eh? But as long as it will save you a little cash . . . If after being used the water still isn't dirty enough they'll use it the next day. While I'm all for saving money, there are strategies which I'd never recommend. But if you don't mind trying . . .