The best defense is a good offense. Don't count on your paycheck, social security, child support, etc., payments to be there. If you live from paycheck to paycheck like many people, you'll be severely hit if the money doesn't post to your account as scheduled. As difficult as it is, set enough cash aside to support you and your family for however long you feel is necessary. Make sure to get hard copy receipts for your records.
Nothing beats hard cold cash in an emergency.
Expect prices to go up, especially if there are shortages of any goods like food. Expect to need and use cash. Most of us buy our food at supermarkets. If there is a breakdown in the supply chain, we could experience shortages or store closures. At least 2-3 months prior, start laying in non perishable basics like, beans, staples, dry and can goods, etc.