I’ve been told that liquid bleach loses its effectiveness after about 6 months, hence I always take a marker and label a date on it. Your best bet for long term bleach is cake or granulated, like the kind used in swimming pools and hot tubs…it’ll last forever on your shelf and just add a little to a jug of water as you need it.

Also, get a couple of cases of the cheapest vodka you can find. In any adverse situation you can drink it, disinfect with it, and most importantly, trade with it. You’ll probably be amazed at the value that $9 bottle of Phillips vodka has a few months has a few months in.