Liquid Bleach AKA CLOROX will degrade fairly rapidly during storage. Eventually you will end up with Salt Water in your sealed bleach bottles.
You are much better off storing powder form calcium hypochlorite
It will store almost forever and you can mix it up as needed to disinfect or purify your drinking water.
One pound will treat many thousands of Gallons and you can also mix up a standard strength Bleach solution as needed.
Especially for folks living in flood prone areas where raw sewage etc can easily contaminate everything that it comes in contact with...you must have an easy method to disinfect everything.
OK...let me do some Copy & Paste so that I do not have to type a whole bunch of info.
Easier yet...you can find all of the information you need on this page about the degradation of regular liquid bleach and the calcium hypochlorite.