With specifics unknown, my mind always wanders to the VERY long term...
What will society have lost if we get hit with a HEMP and are back to the Medieval age for decades in some places. The chaos and destruction that follows will wreak havock on our way of life. Institutions of all kinds will burn. Resources will be cut off and hoarded. To say it will be a tough time would be the understatement of the century.
To prepare for something like that:
Supply of various leathers and bolts of fabric with thread
Rendered fat and lye
Supply of, or source for, lamp wicks
Durable hand tools
Detailed literature on identifying/handling complications while delivering a baby
And others that don't come to mind at the moment...
That may have been way far out in left field from what you had in mind, but it's late, and that's where my head goes sometimes.
Of course, if this plays out, we'll just be invaded by whatever force did it and be no resistance at all. So who knows if it's worth thinking about anyways.