Or, you can plant Sunchoke Sunflowers that make tubers that taste like potatoes and they reproduce on their own. Plant them one time, and they make others underground with those tubers. Leave a few tubers the first time, and they will reproduce like crazy.
The problem with regular potatoes is, you need potato slips every year to grow more potatoes. In a SHTF situation, you can't buy or order more slips, so you have no more potatoes. The potato like Sunflower tubers, keep growing forever. Use the tubers exactly like a potato.
Not true...you can save potato seed to grow out the following year.
No one I know who has tried to eat Sunchokes tried them more than twice: once boiled and once fried. Even the cows won’t eat them.
In my area, they have become a wild invasive species. Anyone who wants them can find them from Spring to Fall by the leaves and flowers. I never have seen them dug up, anywhere, in over 30 years.
detailed instructions with pics for storing seed potatoes
http://alpinegarden.blogspot.com/2010/03/sprouting-potatoes-what-to-do.html
photo of potato berries. These are produced on the top of the stalks at the end of the season. The seeds are inside the berry. Potatoes and tomatoes are related.
http://www.backyarddiva.ca/are-my-potatoes-growing-tomatoes/
Mature potato seeds and a place to buy them
http://www.doublehelixfarms.com/true-potato-seed-TPS