Please take my word for this and do not ask questions:

Purchase six months worth of long-term storage food (food buckets, rice and beans, etc.).

Purchase 1 Sawyer Squeeze per person in your household.

Purchase at least 4 mylar emergency blankets per person.

Purchase a ferro rod.

Take some cash out of the bank and keep it in a safe place.

Purchase gold and silver coins (as many as you feel comfortable forking the money over for).

I don't need to tell you to buy guns and ammo, and if you need to be told that at this point, you've got worse problems.

If you live in a humid area, purchase some citronella candles and mosquito spray.