I'm going to say for a natural disaster situation, one month of supplies. be it tornado, blizzard, hurricane, volcano, etc. Civil unrest, or terror attack, one month, with emphasis on self defence, and evacuation modes, be it by land, sea or air. Capabilities to bug out. For an absolute collapse of infrastructure, it's not about what you've prepped physically, it's what you know. How to navigate, mechanical aptitude, ability to forage, scavenge, hunt, the whole mindset of make do, or die. And as we all know, it won't happen as we expect. We won't be "prepared" for it in a literal sense. It will happen when we least expect, and have to be able to adapt and overcome. And, as much as I hate to admit, I'm not prepared for any of it.