Here are some ideas for things to put into a 72-hour supply kit, for emergencies.
Batteries Eliminate the need to run through the house looking for batteries ever again. Use a plastic tackle box with multiple sizes of openings to hold your batteries, grouped by size.
Water Storage! If you have empty glass jars & bottles taking up space on your storage shelves, use that space for safe "canned" water storage. If you are used to preparing your own canned food, it is actually very easy. Use the same method as for open kettle food canning. Sterilize the jars and lids just as you would for any type of canning, and add clean, boiling water and seal as normal. Cool and store.
YOUR ADDICTION. If you are addicted to something and feel you cannot live without it, pack it. I am addicted to coffee, so I keep canned coffee drinks and instant coffee powder on hand. You do NOT want to go into addiction withdrawal during an emergency! If you are a smoker, pack smokeless whatever (snus, for example, or nicotine gum), because a lot of shelters/friends/motels/etc won't let you smoke--and, if there is gas leaking, you may explode.
INSECT REPELLANT: Yes, it's true that I generally use essential-oil based stuff to repel bugs. However, in an emergency, I know from first-hand experience that you need something a lot stronger--unfortunately, it's probably going to take DEET. You need to abolish mosquitoes, ticks, biting flies, gnats and chiggers from your life! Be sure your pets have theirs, too! (Frontline, plus, Heartworm meds, etc.)
5" Church Key Can and Bottle Opener -- if you want to open bottles and pierce cans, this is the one for you.
Preserved food--yes, it's great to "can" your own food by putting it up in glass jars. However, if you have to move with your kit, glass easily breaks. Be sure to stock food ready to eat in cans--AND--and this is super important--BE SURE IT IS FOOD YOU DO NOT MIND EATING STRAIGHT FROM THE CAN. If you don't want cold soup, for example, don't put it in your kit!
PET FOOD--if you have pets, your kits need to include items for them, including food, water, bowls, pet first aid kit, restraints, toy, and crate. I've evac'd for over a month with a puppy--you have to prepare for them if you consider them part of your family.