This year with our drought wheat yields in Texas came in between 3-25 bushels per acre. Those yields were using modern farming methods, machinery, herbicides, pesticides and fertilizers (organic yields are traditionally 30% less).
A bushel of wheat is 60 lbs.
1 lb of dried wheat = approx. 1 lb of flour (15 oz instead of 16)
A large loaf of bread uses 1 lb of flour
Doing the math, on the high end, that is 1500 loaves of bread. Low end 180 loaves per acre.
Unless you have a way to consistently irrigate and or/ plant far more land than you *think* you need, you may find yourself short. This also stands for hail storms, high winds, floods/standing water....and WTSHTF, raiders and thieves.
You will also need space for livestock grazing or a large enough swath of land to sustain wild deer, hog, fowl, rabbits etc for meat production.
You will need multiple people per acre to work those fields by hand, which means, fewer folks standing on security or other needed jobs. There is a reason the farm families I went to school with had 12-15 kids!
You will also need a storage facility for the year's grain crop. Once properly cured, you have keep it dry, temperate, ventilated, free of bugs, vermin and fungus. Stored incorrectly and it can rot or worse, the dust can explode and start a fire.
https://www.world-grain.com/article...s-causes-and-prevention-of-stored-grain-fires
Growing your own can be done but a "victory garden" isn't going to quite do the job.