Some things I recommend as prep (which are good preparedness actions regardless of whether this happens or not) 


A few months supply of essential needs—food that has good shelf life, water (or access to water), energy (solar panels, generator, oil, gas, propane, candles, fire pit, wood, matches, lighters, flash lights)

Going to want to have away to boil collected water at the very least. If you have other purifying methods that is a plus. 

Alternative comms such as ham radio. 

Save all your important files and digital information on one or more external harddrives

Home defense 

Your bitcoin on an air gapped hardware wallet 

Cash on hand

Decently stocked medicine cabinet including a reserve of any necessary prescriptions

Community

Some kind of plan, especially somewhere to go (and a plan to get there) if things get really bad and where you live becomes unsafe.