For those folks who aren't fortunate enough to have space available for food plots or to keep animals, or those who are too old or infirmed to make and tend gardens, one way of banking food goods and necessities is to buy long term survival food and supplies from a reputable supplier, if you take meds you can talk to your doctors and request scrips for three months supply so that you'll have time get meds should supply chain interruptions occur.
Another important consideration is clean water, should power be interrupted well pumps may not work and some municipal water delivery systems may not work as well, keeping bottled water on hand is a good idea, so is having some kind of water filter that purifies water, Sawyer water filters are inexpensive and pretty efficient, simple water filter don't remove bacteria or heavy metals, so make sure what ever you purchase purifies as well as filters out impurities.
If you decide to purchase long term survival foods always check out the suppliers you decide to buy from, while there are a few excellent suppliers on the market, there are also a bunch that are not as honest or reputable in their advertising or quality of products.
If you buy in bulk you can usually save money, buying a four week supply for example will cost you less per portion than buying a 72 hour kit, also check what you're buying, you want prepared foods that all you need to do is add water and cook, stay away from bulk grains that usually need extra milling and preparation, and a lot of work to turn into something palatable, also look closely at the calorie numbers of what you're purchasing, three meals a day of standard sized portions should give you about 1800 ~2000 calories per day per person, portion sizes that add up to 1500 calories or less a day will put you into starvation mode over time.
You'll also want to diversify, besides carbs, fats, and sugars you'll need protein, veggies, and fruit, be sure to include some in your prep., dried fruits are a good source for long term storage, dried veggies are also a good choice, another good source of greens is sprouts, you can raise sprouts quickly for greens and for salads easily indoors or out with very little work, with a few trays of sprouts going you can have an endless supply of fresh veggies and great tasting salads.
Some tings that don't usually come in kit form or packaged food plans are sugar, rice, salt, coffee, tea, powdered milk, coffee creamer, yeast, flour, baking powder or soda, and don't forget powdered eggs for cooking, baking, and breakfasts, some you can buy at your local market like salt, sugar, baking powder and soda, they will keep for long periods with not much prep, however flour, yeast, rice, oatmeal, corn meal, cream of wheat and grits can go bad or get bugs if not packaged properly for long term storage, it's easier and best to buy them from survival food stores.
You can also get some survival gear from survival food suppliers and from private food banks as well, one very good source is from the Church run regional food banks managed by the Church of Latter Day Saints, and they will sell to non church members.
My best supplier has been My Patriot Supply, their food is great, easy to prepare, relatively inexpensive, and they deliver to your door within two to three days from receiving your order, most of their survival foods have aa 25 year shelf life, one year after opening the individual packages, and if you order $100.00 or more shipping is free.
I just ordered again this afternoon, a couple of more bags of coffee, a #10 can of creamer that can be used also for cooking and baking and deserts, and I also ordered more sprout seeds and a bucket of dried fruit & veggies, I try to purchase about a hundred and fifty dollars worth per month when we can.
I not so worried about a SHTF event as I am about supply chain stoppages, I'm also stocking up on TP and other cleaning supplies, I'm not going through that exercise again if I can help it.