"The problem with eating a cow is a big one (pun very much intended). In a serious emergency/disaster you have to cut it up and keep it from going bad."
"unless you know how to process the meat!"
Yes and no, I would imagine. I’ve seen rabbit and squirrel being dressed, but that’s it.
Best case, cool/cold weather and you have help plus a generator and fuel. Worst case, hot weather and no help
OK, worst case is that zombie cow.
"there is a lot in your list I wouldn't eat. I cook most everything from scratch as it is, so I guess I am always pretty well stocked up"
In the worst short term situations, that may not be ideal for many. Say that a terrorist group explodes a dirty bomb in a city, and then makes the water undrinkable for several major cities.
Time is short and you have to move quickly. You throw a couple of hundred pound bags of flour in the getaway transportation of choice and move out. Every time you start a fire to cook, you have people dropping by saying "Gee, I saw your fire and smelled your food and I don't know how to start a fire, you know. When did they, like, take the cigarette lighters out of cars anyway, not that I had much gas in it, you know. Gee, like, you got a lot of food, you know". And you shoot them between the eyes the next time they start to say "you know" or "like".
Worst case for most people is that they have no way to process/cook the food. Or that they are injured with no way to get to help. Say the building you live in has partially fallen on top of you during a major series of earthquakes, and your leg is broken. But
you are concidered on of the lucky ones.
I would think that, at a minimum, one quarter to one third of your food should be readily consumable. Far out in the country you may be fine though. For a while.
Interestingly, my neighbor is from Central America. It is VERY strongly ingrained in him that you always help your neighbor out, because you never know when disaster (fire, hurricane, flood, or mud/land slide) may hit.