adam2, regarding breweries canning water in an emergency, I once saw one of those cans. Beer can water. It's a great idea for long term water storage. To your or anyone else's knowledge, is beer can water available for consumer purchase?

Try contacting Anheuser-Busch. See Anheuser-Busch Stops Brewing Beer To Produce Cans of Water For Flood Victims

EDIT: Note that while I don't really consider it part of my emergency stash, I usually have a couple of 12 packs of La Croix sparkling water around the house, which could be helpful in an emergency. That would be about the same as water in beer cans, with the addition of mild carbonation and flavoring.

Not so far as I know, but there was and probably still is a supplier that sells canned water for long term storage in case of an emergency.
The beer can water was intended for near term use and might not keep that well, but the canned water sold for survival use claimed a long shelf life.

blue can water

Edited to add link. This is the supplier that I was thinking of. I have no connection with them.

Water keeps indefinitely if it was clean to start with and is kept away from light. I would expect canned water to be good as long as the can maintains integrity. In a cool dry place I'd expect at least a few years.

The US govt canned emergency water I have used requires a slap on one end of the can. If it "clicks ", the water is good. If it doesn 't "click". The water is bad.