Make sure that all prescription medicines have at least a one-week supply, and that you have a good stock of nonprescription stuff that you use often. If the power is out, the computer system at the pharmacy where you expect to get your meds -- you know, the one that stores your prescription -- is likely to be out too... and migraines are bad enough when you have your meds (both prescription and nonprescription) and you're not stuck without power.

Of course, the same goes for any pet meds, even the "routine" ones like heartworm. Keep 'em on their routines!