What if every roof of every house of a subdivision collected Rain Water went through a tube collectively from all the roof of all the houses of the subdivision then got filter pass through a mesh net filter the water and all you had to do is add clorine and what if every roof of every house of that subcivision had a plastic covering it and you still filter it through the messh went through a large Tank and created the Subdivision swimming pool, like a LARGE indoor swimming pool for the residents of that subdivision...or as a storaged water for when the water goes out to take a SHOWER ONLY...

And if you had a heating system to heat it up you could create: an Indoor Warmth Swimming Pool for the residents of that Subdivision....ALL YEAR LONG, except for summers....

I owe part of this idea to a documentary about the USA midwest about dustbowl on the history channel something about wrapping a home with plastic to prevent it from dust...And a program of a company that was going to collect water from the rain to make beer (think it was Fox News) they were saying that beer could be made at home...