What do you consider long term?
I'm on full rainwater collection. No public water, no well. We have a 40,000 gallon tank that's full now after the recent rains, and that could last us for about 18 months. The filtration is a sand filter at the tank along with an ozone generator, and two canister filters and a UV light at the house. I haven't actually looked into this, but I suppose you could do without the sand filter if you have a decent filter at the collection point. The ozone is a good disinfectant, but bleach could replace that, I suppose. The final thing is the UV light which kills just about everything and draws about .5 amps. If you can run that and a pump off of some solar, you might have a stand alone system that could sustain you for a while (assuming it rains).
I'm on full rainwater collection. .
Water from your tap has already been treated if you are on a city water system. But bleach is the easiest and cheapest way to "purify" water. If you are going to treat large amounts you can use pool "shock" which is essentially concentrated bleach.i read on some of the prepper sites that you can store water in gallon jugs for up to a year with just a few drops of bleach in each container
what is the typical shelf life of bottled water? (store bought)?