Well, I don't think I stockpile....at least not in the since of "forever" issues. Personally, I just feel that's the reason for becoming "self-sufficient" as much as any other. There is almost always enough of most healthful needs to carry me through about 6 mos to a yr of necessities at my house, including bullets to defend it.
As much as stockpiling, I feel that knowing how to produce, preserve, butcher, provide is essential. It's one of the reasons I work at adjusting the growing/storing of animal feeds as I am now trying. Suppose I was not able to buy the hay? See? Now, water is an issue and I do have a generator that would run the house electric as long as I had gasoline! OK, now there's an issue for long term. LOL I generally keep 5-7 days worth & could go 10-14 days by limiting run times.
I do live within 2 miles of a river, could use horses & harness to take tank and haul -- but, THAT would be a job! Do have a good old well at lower end of property and a hand pump that I could connect ... better option! (It's an old dug & stone walled one). Chickens, eggs, goats, milk, cheese, butter, yogurt, garden....plenty of seeds, can hunt, it's just hard to project when, what and WHY we would have the needs.
Living within 60 miles of one of largest naval facilities on the East Coast, I know the most elaborate defense system is in place. So it's either live or die, literally. With that being so, I guess I'm on a "1 yr plan".....so long as I can make it 1 yr I'll be ok. Sustainable living is important and that incorporates the ability to live without these modern conveniences we currently enjoy. I can do that -- working on some solar for ability to enjoy some of the "luxury" items, if any are still there should a war strike occur. Otherwise I have washboards, clotheslines, canning equipment & canned goods, solar oven plans, can build a fire, cut wood, survive many extremes. There are those who would not know what to do without McDonalds!
Guess I work at "survival" issues more than true stockpiling. But I do keep more than most locals in my pantries & closets. & know alternatives for many needs
CHOCOLATE is a necessity! FOR SURE ---