We store a supply of the things our family already uses on an everyday basis. Rice, assorted types of beans, oatmeal, a number of types of wheat berries, sugar & molasses, salt, baking powder, baking soda, cocoa powder, yeast, olive oil in metal cans, coffee beans, home canned meats & veggies, etc... We store a few luxuries also, again, things we use now. For instance, Sunday evening meal is a snack so my wife does not have to cook anything fancy. Popcorn with ranch powder or cheddar cheese powder, home canned grape juice, mint tea (in season), one of us may make soup or grilled cheese sandwiches or something simple. Perhaps we will open a few quarts of homemade venison BBQ and make sandwiches on homemade wheat or sourdough bread. We do not store a lot of powdered milk, if we are making cheese or butter and need unpasteurized milk we purchase or trade with a local farmer for it. I would expect to do the same if it was not available at a store, and the dairy farmers at that point will need rid of it anyways if it is not being picked up or if they loose power to run their milk tank coolers.
We do not have a lot of freeze dried foods. They are expensive in a calories per dollar, and we are a large family of 10 (with 4 teenage boys) to feed, plus additional family members that we have food stored for. We live in an older large farmhouse, and we have the room to store a few extra buckets of food for them, as well as a root cellar in the basement. We have a fair sized garden and we preserve by canning a variety of veggies, fruits, and meats. We usually can between 500 and 1000 quarts per year depending on how the garden and hunting seasons produce, as well as how much is left over from the previous year. We also vacuum seal and freeze some items.
None of this is actually cost effective for us. I own a rural general / discount grocery store. I can purchase veggies and fruit more cost effectively than I can raise my own. I can purchase meat when it is on sale (yes, the stores buy what their suppliers put on sale at times) already packaged without the trouble of raising it, butchering it, and packaging it. I have all the food I need at my store.
Getting my food at the store is convenient. It is also a good place to teach my children how to work and get along with others. What it does not do is teach my children how to raise and work a garden. It does not teach then how to raise livestock, hunt, butcher and preserve. It pays the bills but does not teach self sufficiency. Our family believes all of these things are important in the teaching of children.
However, The store can burn down. The store can be looted. The contents can be confiscated by the government. Re supply may not happen consistently (we are seeing this now). It would be foolish to depend on a single source of food, just as it would be foolish not to have my children learn the skills that will help them to survive if times get worse.
The internet is full of videos on how to store the basic food supplies a person or persons need to survive. Food costs as a percentage of earned income even with the current increases are still at historical lows. Watch a few videos, read up on the recommended food storage amounts from the Mormon church. Purchase some basics food supplies and package them. You will save a some money by doing this yourself instead of purchasing already packaged food, and a lot of money over purchasing prepackaged freeze dried foods.
One final thing. History has shown that during times of inflation food costs will increase. During times of hyperinflation, food may not be available, or the money you have may not be accepted for it's purchase. Properly stored food will hold it's value, and help you survive that situation if it should come. Excess food could also be sold or bartered if necessary. If the situation never happens, you can eat your stored food and loose nothing other than the little money you spent on packaging supplies, and the time you spent storing it.
I was not raised in the country, I was raised in a city. In my younger years our family did not have a garden, and meat came from the store. My wife and I chose to move to a rural location. We choose to live a simple lifestyle, and enjoy working together as a family and preserving the food we grow. We had no experience with any of this, and the internet was not yet common when we started living this way. With all the free available information these days, it is easier than ever to learn how and what food to store.
Sorry this got so long winded.