"Preparing now for a future where water is scarce is never a bad idea.
Rainwater harvesting allows you to become more self-sufficient by having your own independent water supply.
In times of drought or when clean water becomes too costly, rainwater can be used as a supplemental source that can help ease demand on well or city water."

It can also be used as a backup source of water in emergencies."
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Picture source: www.curioushalt.com