It is very easy to store enough food to last a long time and have enough calories to live on, the problem would usually not be about total calories, but necessary nutrients.
For instance, without enough protein your muscles and connective tissues could suffer. You can get protein from dried beans and other plant sources, but they aren't complete. Milk eggs & meat have complete proteins.
Jerky can last a long time, packed fresh around 2 years (judging by the sell by date on some I have), I'm not sure about frozen.
I read that, per acre, cod will provide you with more protein than beef, and you do not need to worry about providing winter shelter. So if you have a pond keeping it well stocked and fishing it wisely could work.
I don't know how long whey protein powders last either.
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