Does this assume we can use what we have already stored or are we starting out like with next to nothing like Randy from the book?
If we get to keep what we already have, I am pretty well prepared. I would pick up a few more gallons of fuel/ some extra propane tanks, I currently keep 8 gallons of white gas, 10 gallons of unleaded (I purchase from shops that still do not included Ethanol pure-gas.org FYI, but soon, that may be a thing of the past) plus 2 propane tanks, and 2 cases of the 1lb bottles and 4 empty 5 gallon jugs since I used to Race I have a metal storage cabinet for these. Even with an EMP, the coleman stoves will still work. Cooking stuff like pasta, rice or the like in thermos's really allows you to stretch the fuel usage ALOT. I would also probally added in some more Rice, currently have @180lbs but considering that will be the main ingredient for most meals it will go quickly. And yes I have practically lived off of rice in a few 3rd world countries. I would top off my vitamin stash, I keep enough plus 50% for each person to last atleast 1.5 years currently, since that seems to be the shelf life of multivitamins. I would also pick up jerky like noted earlier, I would stack it deep, but it would not be cheap. Looking at my food storage inventory, I have a good deal of shelf stabilized meats available. But more cant hurt. Then I would by a few more cases of the cans of Morning moo milk, plus some evaporated and condensed milk to enhance the flavor a bit. That makes 5 for me.
Rice, fuel, dairy, jerky, vitamins.
However you need to consider that I am pretty well prepared, its not only a Utah thing, but a thing that grew on me when I was a child since I have a child hood that makes most appear to go into shock when I start to describe it.
If I was started from scratch, I would say the same items as above as long as Randy had a coleman stove, or 4 like me.