If you've got an older toilet in your house (not the High efficiency (HET) models), you're using more water per flush than necessary, which depletes resources and your wallet. Here's a simple trick that costs less than installing a new toilet.

Fill an old, plastic soda bottle with water and place it inside the tank. Let's say your family flushes the toilet five times a day. Since the bottle displaces exactly 2 liters of water, that's 10 liters you won't be pulling into your house (or paying for!).

Again, don't try this with a HET. But those of us with older models may give it a try.