Comment: I would start with the basics in primitive survival techniques.

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I would start with the basics in primitive survival techniques.

For instance, I would focus on water distilling and shelters. Those two alone require a lot of information. For instance arid environments, the technique for water collection can't be used.

I also wouldn't worry about zombies unless you mean "zombies" as code for large mass of unprepared Americans caught with their pants down in a societal/financial breakdown and after your goods for their own survival.