bare minimum inventory for single person survival
100 oz of silver - preferrably in pre 1964 dime form (for easy transaction and verification) keep 10-20 oz on you for transactions, bury the rest
5 oz gold (bury this in a separate place from your silver) used as a backup in case your silver stash is compromised
food rations - 100,000 calories in densely packed energy bars.
a shotgun
a 9mm handgun
2000 rounds of 9mm ammo
500 rounds of buckshot
500 rounds of bird shot
500 slugs
learn to conquer your conscience. The first few raids you do will be against unarmed individuals. You must convert the strong into workers, and extinguish the weak.
build a colony of workers.
The women may appear weak, but they are valuable when recruiting other raiders to join your colony. keep them in a secure area, and make sure they are well fed and as much as possible clean healthy.
The child bearing women are a premium. Keep them healthy at all costs if you want to rebuild a semblance of a society after the collapse.
recruit other armed raiders to join your community as a soldier class
There will be skirmishes between other clans. Be wise and only enter into battle when absolutely necessary.
Make allies but don't fully trust anyone not branded with your sigil
When the skirmishes die down you can begin to breed with the women
Establish a religion or use an already established religion to capture the spirits of your denizens. Make sure there is as little crime as possible within your borders.
After decades pass. When things start looking more normal. You can begin freeing members of your community into the world to venture out and begin life anew.
You have just saved the world.