The operative word there is healthy. A healthy diet is rich in fresh fruits and vegetables, lean meat/poultry/fish or other sources of protein, low fat dairy - hard to do in long term shelf stable. Things that are shelf stable are mostly carbohydrates, pasta, flour and so on, or canned. Canned is awful - too much salt, no nutrients in any canned vegetable or fruit.
But, beans with rice are a complete protein, and both are shelf stable for a long time. You will have the hardest time with vegetables - if you can't have fresh, then frozen is best. Few vegetables come in glass, unless you love artichokes and marinated mushrooms - and these are expensive and have fewer nutrients than frozen or fresh. Tomato sauces would give you some vegetable servings, just be sure to buy in glass containers not metal. There are some processed fruits that come in plastic packed in water, but those will be expensive. There are some low sodium canned proteins like chicken or tuna, but you have to read labels. Frozen foods keep well up to a year if frozen in airtight containers. Cheese and butter can be frozen. Powdered milk would get you by when baking, and in a pinch, reconstituted for cereal. Baking soda and baking powder for making bread are essential, keep the extras in the freezer. Vacuum packed nuts could also provide protein. Peanut butter and mayonnaise can be kept on a shelf until opened so they could be considered shelf stable.
Have you thought about getting one of those vacuum sealers? That might help keep frozen things from getting freezer burn. All of the above assumes you want to prepare full meals from scratch.
Not from scratch, bread and muffin mixes keep well, and some only require adding water - Betty Crocker and Krusteaz ones are good. Other than that, I don't use premade boxed meals like hamburger-helper and the like, so can't advise about things like that.
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