Unless everything is burnt to ashes or contaminated to hell, the world and it’s contents will still be there and the resourceful will probably survive.
So why aren’t the “professional” prepper, survival, and survivalist guru’s teaching you how to scavenge for what you need?
Do they have moral, legal, religious, or ethical hangups about teaching you how to take what you need to survive?
Or maybe it’s because they only want you to buy their latest “must have”, that one piece of equipment that they say will probably save your life?
Or is it that they just don’t know how as it’s not covered in
FM 21-76 The US ARMY SURVIVAL MANUAL.