[anton]

I have 40,000 gallons in my pool which if covered does not algae or mold. In fact, I pull off the plastic cover in the Spring and you can jump right in.

Speaking of which, for rainwater, a 45x25 foot pool cover stretched between three trees and a cement block in the middle will fill a 50 gallon can with water in a three minute rain without all the debris that comes with using roof drains.

And, that same pool cover if hauled up 20 feet into a tree and hung at an angle provides a shelter with all day shade and no bugs.

I guess what I am saying is that I save those “throw away” reinforced pool covers for the SHTF day.

[SJSAMPLE]

Yep.
And those little inflateable-ring kid pools work well as a blivet, too.
In a hurry, you can set them up and fill them.
About 600 gal in each of mine.