What is one way to recycle or reuse water?

In some cities, waste water (that goes down your drain) is already being collected, purified, and re-introduced to your citys' water system.

A desert water-collector can recycle some of the water introduced to the collection pit, but it is not really enough to make it worthwhile. Foliage works better, and this is really a survival tip, anyways.

Some people use "rain barrels" to collect water for the purpose of watering their trees and shrubs. This technique does not work well where the water may freeze overnight.