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.
You can't eat cash or metals.
If you don't already have enough to survive a few months of terror, you're not going to survive it anyway.