I installed a 30k gallon metal tank in my backyard so that I can run my entire house on rainwater. Often called a rainwater catchment or rainwater collection system; this has allowed me to avoid using city water and to catch free water from the sky instead. Think of it as a pool-sized rain barrel crammed into my backyard.

If you would like to contact the installer I used (Jeff Sergent) in the central Texas region you can find his contact info at : https://suburbanbiology.com