Your run-of-the-mill shoe stank might not pose much of a survival threat, but trench foot certainly will; baking soda is great at absorbing the moisture that might otherwise literally cause your feet to rot off your legs. As for the health of your teeth -- it will be pretty hard to get through your day's rations of homemade jerky and hardtack without some high-quality chompers. And you certainly don't want to rely on that pesky fluoride that will "kill your brain over time" (um, what?).
But this is a situation where we can achieve a lot through a simple ranking system. If we prepare for the far most likely disaster to strike us (for me it’s a tornado or extended power outage during winter time since I live in Alabama in the infamous “Dixie Alley”), we will find a pleasing truth…we will generally be prepared for many of the other types of disasters on our list by default, already.
The overall contents of your doomsday supply list will be based very much on what sort of shelter options are on the table, and how well-stocked with food and water such a safe house is. To get through that critical period of fleeing to a safe location, survivalists recommend keeping a "bug-out bag" on standby, with enough supplies to get you through the first 72 hours or so.
Dozens of websites and books offer advice on supplies to have on hand and in stock if "the end of the world as we know it" – TEOTWAWKI, as it's known in survivalist circles – comes to pass. Here, then, is a rundown of the supplies you'll need to ensure that this proverbial "end of days" is not an end for you and yours, but rather a new beginning. [Could Cockroaches Really Survive a Nuclear Blast?]