If you're just looking for normal emergency food, dehydrated camping meals are excellent. Lots of calories and sodium and they've got a good shelf life - plus you can rotate through them on camping trips.
Might also want to purchase a camping water filter so you can pump-filter the water. Purifying tabs are probably also a good idea, depending on your source of water.
Other supplies to have on tap are some basic OTC meds:
- Aspirin
- other pain relievers
- anti-diarheals
- basic cold and cough stuff
- benadryl (great for allergic reactions
- mouthwash, toothpaste
- antiseptic creams, alcohol wipes, etc
- rubbing alcohol
- witch hazel
Just a few off the top of my head.