The best summation of post major nuclear or grid down event is this.
Read up on warlords cultures.
That or be so remote and capable that you live where no one will find you and you can revert to tribal lifestyle.
Personally I would much prefer tribal.
That can be impacted much more significantly by your own input and less of others
Everyone needs to remember that Iodine pills will only protect your thyroid from radiation. The rest of your body is still fully susceptible. Iodine pills are important, but they're not a magic elixir. Knowing how to protect yourself from hard radiation is just as important, if not more so.