Most of our long term supplies are in the form of staples -- cornmeal, wheat, beans, rice, sugar, etc. plus lard in the freezer and some spices and some freeze dried potatoes. I know what to do with staples and can make lard biscuits, corn bread, tortillas, soda bread, etc.
We would most likely ration our staples and try to supplement them as much as possible with small game and foraged food from day one ... not because we don't have the usual stockpile of food, but because we would want to try to stretch it out for as long as possible and we would be patrolling out in the wood anyway. If I could kill it with an air rifle, I would. (Air rifle is not entirely silent, but quiet enough that it won't give me away to someone the next valley over.)
We live in the middle of several hundred square miles of national forest and while I figure big game and cattle will be gone quickly, most people won't bother with small birds and rodents, few realize prickly pear pads are edible and virtually nobody knows manzanita berries are. There's also a nearly endless supply of crawdads and most people do not know how to catch them without a trap.
We also have goats and chickens and a decent sized garden that we would quickly expand.
Some days, we'd probably eat very well -- rabbit stew with garden veggies, grilled dove or quail with wild raspberry sauce, or several pounds of crawdad each. (Crawdads would be really valuable because of the fat content in the livers, too.) Others, we might have a small piece of cornbread three meals a day.
If the situation looked dire enough I'd probably even find out just what chapulines taste like ... every grasshopper caught is one less grasshopper in the garden, LOL.
I could stand to loose some weight anyway. *shrug*
Our ancestors ate the same way. If they did it, I could too.