THAT’s what I do, too....bleach containers, etc...fill them with water...and stash them, with the date.....I rotate once a year. I suppose I wouldn’t have to rotate “cleaning” water....but, I have.
Well, before I started, I was always somewhat dismayed at the simple VOLUME of my trash that was empty plastic bottles. And I had already bought a couple 5 gallon plastic water jugs for storing some water, then the light bulb finally went on!
The only negative I can think about plastic is you have to keep it out of the sun, because the UV light can degrade the plastic to an almost sawdust consistency.
But think about it. Bleach containers, windshield wiper fluid containers, I personally love grapefruit juice so I get one or two of the 64 fl oz grapefruit juice containers a week, heck, it adds up FAST!