I spend a lot of time at www.homesteadingtoday.com, where a few of the posters are doing just that.
One thing is for sure, you will need a cash crop, because the tax man does not take barter and there will be some things that you need, like
gasoline and shoes and such. The cash crop may be flowers or
cattle or whatever, but you will need to be able to sell something! And, as one person already mentioned, writing works too. One man in a
magazine many years ago stated that "If you can provide yourself with food and housing, you can work at McDonald's and live like a king"! While I think that is an exageration, he does have a point! Our
mortgage plus the grocery bill takes up almost half of our income.
At any rate, back to self sufficiency.
Folks in North Korea are often paid only pennies for their work, and while the government will house them what are they to eat? The government used to distribute food but now they mostly do not.
Many of the North Koreans have gardens, raise
rabbits, and buy grain. The sale of some vegetables brings them the money for grain. It is a meager existence but they are surviving. I personally like to have oranges in the winter and such, but a person can live without it!
The thing about rabbits is, you do not need refrigeration. You can eat rabbit one day and eat the leftovers the next day, and the food has not had a chance to spoil.