In my case, it would take a long time. I usually keep a gallon of white vinegar for pickling, but it takes a couple of years to use it. I used to use a lot of bleach for disinfection and had a lot of empty bottles to do something with. I had a couple of 500 gallon per day reverse osmosis machines that I maintained, so I would fill the cleaned empty bleach jugs with purified water. Since I don't do that any more, the easiest thing to do is buy the higher quality gallon water bottles and reuse them.