By the way, I'm not so sure it's necessary to add bleach when you fill up. I don't. I know it's a common thing to recommend, but seems redundant to me. I think it's more prudent to use bleach or other disinfection method at the time you use the stored water, just in case. It's highly unlikely that clean water, stored properly, will grow anything (unless you use untreated well water or something like that), but if there are any critters in there, you'll want to zap them at the point of use, not when you put it away.
I quite agree. On one occasion I cached a gallon of water during a project, storing it in a rock shelter in the shade. I returned and used it a year later with no treatment of any kind and no ill effects. Some sort of treatment, say, boiling in order to make a nice cup of tea, would be prudent.
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