There are vaguely 3 categories of catastrophic events: I - many long-distance supply chains are unreliable or broken II - long-distance supply chains are brok

There are vaguely 3 categories of catastrophic events: I - many long-distance supply chains are unreliable or broken II - long-distance supply chains are broken, even for essential bulk goods III - local social collapse / [civil] war zone Which might be summarized as (I) stockpile tech stuff, (II) stockpile food & fuel, and (III) join a hard-core local militia