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.