Contingency planning makes all the difference in the world. When OPEC oil crisis hit in the 70's, only Shell Oil had done contingency planning for such an event, and it was the only major oil company who had a backup.

So my feeling is: have a contingency plan. It doesn't have to be elaborate and it doesn't have to be time-consuming or expensive. Just do a thought experiment about what you would do and make sure there are no barriers in that plan.

For example, have some water and food that won't spoil. It's not hard to do, and it's generally a good idea. Things like that.

No one thinks society will really collapse. But companies like Shell Oil know that a tiny amount of planning for any contingency is just smart.