Do you have one? Is it kept up-to-date? Do all members of your family know where it is and how to use it?
As the article points out, a family discussion about this is the most important item.
Let there be light
Just whistle
AM-FM radios
Power packs
An extra:
Wrap them in foil
One other thing is to have plenty of bottled/canned liquids and long-term foods.
Details with more links @ Need an emergency kit list? Take this pro's advice