Who Owns The Rain?

I know, it sounds like a Creedence Clearwater Revival song, right? But since rain falls everywhere, you would think that no one could claim it as their property.
But, apparently, in some states, it's illegal to collect rainwater, because the water belongs to the state. I'm sure some of you are thinking that is some sort of reconstituted hippie thing, that collecting water affects aquifer and groundwater supplies. Actually, it's completely the opposite.
So any multinational death conglomerate can tap into an underwater spring, purify and put it in plastic bottles, and that's not a problem, but collecting fresh and pure rainwater is illegal? In past times many people had rain barrels in their yard, at what point did someone say "Hey! You can't do that! You need to pay for water from the city!"
A news study says that thanks to global warming"climate change", 70% of US counties will face water shortages. So wouldn't it be prudent for people to now begin collecting and savingn water? Wait, conservation is the opposite of the American Way! Use it all up, then bomb some foreign country to take theirs because they're not using it up fast enough. Besides, once the polar ice caps melt, and water levels rise, won't there be more than enough water?