My main concern would be lawlessness and the risks of violent attack or robbery/looting.

MOST aspects of disasters can be planned for.
Food shortage=keep a supply, grow your own.
Water shortage=keep a reserve, rainwater capture, means of purifying.
Lack of vehicle fuel= keep a stock, learn to live with less, and perhaps none.
Lack of home heating fuel= Keep a stock, burn wood.

Preparing for lawlessness is more challenging. Keep firearms and carry same where lawful, but the other lot might be better armed, more numerous, or simply lucky.
Knives, sporting bats and the like certainly help, but again the other lot might be better equipped.

Potentially having to defend yourself is an "unknown unknown" To what extent, and against whom.

Another concern would be a situation that feels like TEOTWAWKI but from which TPTB DO recover and later prosecute one for murder, under conditions when killing in self defence felt justified AT THE TIME but which later looks like cold blooded murder.