I need help learning about "Survival/Crisis Gardening"

For lack of a better title, I would appreciate some help learning about "Survival/Crisis Gardening". What I would like to do is educate myself and prepare for a "food crisis" in the event of a catastrophic event in our country that ends our ability to go to the grocery store to get our food and we need to live off our own land again. I need to find varieties of seeds that will produce not only their 'fruit' but also produce seeds to plant for the following year. I need to learn how much seed you need per acre, how many acres per family, what the best crops are to meet nutritional needs, etc.? ...Do you follow what I mean? If anyone here knows what I'm talking about (LOL) I would deeply appreciate their help. :) ....Hopefully the "need" will never happen, but I think it's wise to be prepared.

Also, If you know of anyone on here who is a wiz at doing Survival/Crisis gardening, please point me in their direction. :)

Can't wait to hear from you all!
Thanks!
Glenda