Rain barrels can capture water off your rooftop that can be used to water flowers, shrubs, container gardens, and other plant life in your yard. They are free once installed and will collect high-quality water that will reduce your use of the faucet during dry periods.
SDSU Cooperative Extension Service
Zdorovtsov, Chris, "Rain Barrels: How to build a barrel to harvest water" (2010). SDSU Extension Special Series. 25.