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?).
Paracord is one of the most versatile pieces of survival gear you can carry. It has applications as diverse as helping you set up a makeshift tent to creating a clothesline for drying wet clothes to establishing a perimeter around your campsite that will warn you of the approach of curious or hungry mammals. On top of that you can use it to transcend physical obstacles like small cliffs you might encounter as you attempt to reach civilization. It’s essential survival gear for the person that likes to be prepared for any eventuality.
Say you're at work and a terrorist attack occurs. Roads are closed to any and all traffic but you only want to get home - even if that means walking. You may not want to grab your full on family pack in the car or you may not even be able to get to it. But you just want a light kit to get you through. How far is it to get home from wherever you may be? This get home kit should provide for 1-3 nights of traveling on foot till you make it home.