You store it in an underground cistern. Downspouts can run into an above ground filtering box of some sort, catching bigger debris. From there, a pipe runs it to your underground storage tank. From the cistern, you can run pipes to your home, pulling the water up by a jet pump. From there, it'll travel through your in-house filtering system.
This is more ideal for toilet/showering. They do have very expensive UV water filtering systems you can set up if you really did want to consume it.
An underground cistern/tank collecting rainwater, coupled with well water and water softener and you are good to go.
Not as easy as city water, but a little work or hiring someone and spending a few shekels can take care of your water needs.
A few shekels? Installing an underground cistern large enough to store a rainstorm's worth of water and plumbing it to your house can easily cost $100,000.
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