Beepers and cell phones may be rendered useless. Outfit every family member with a walkie talkie and laser pointer. A laser pointer is a good way to find someone in the dark. Each person should learn Morse code to communicate with the laser pointer. Stock Piling Power outages may occur.
Batteries are essential.
Make sure you have the proper terms that are powered by batteries. Radios, flash lights, dildos. Every woman should have a battery operated dildo. Be sure your wife or girlfriend has one. It will keep her mind off of the fact that you didn't buy enough food and water.