Captain Obvious here... just be sure that if your water supply is intended to be part of your evacuation plan, that all members that might be needed to handle a load out can actually lift the water containers... I use two of the civilian (blue) version of the Scepter 20 liter cans, in addition to some much older "aquatainers"... the filled 20 liter containers are 44# each, and much easier to transport with some form of a rolling dolly... I routinely add 2ml of chlorine bleach when they are rotated at the beginning of the tropical storm season...I have a .1 micron family size filter as well as a .1 micron mini... if you use pool shock to pre treat for any virus smaller than .1 micron, a chlorine test strip designed to read in the 0-5 parts per million range, can provide you with a correct size "dipper" to administer the shock to a 5 gallon of suspect water... I use a .22lr casing soldered to a piece of #12 copper wire, trimmed to the correct height...you will need to determine your dipper according to the available chlorine percentage of your shock...