Wheat is a staple food. Even if you've been doing the gluten-free thing, chances are you won't be so picky when it comes to a survival situation. That's why it's important to stock plenty of wheat berries in your supplies, and equally important to be able to mill those berries into flour.

Buckets of stored wheat is a common sight in a prepper’s food pantry. A single 5-gallon bucket of wheat holds about 47,000 calories; it can produce about 25 loaves of bread, and will store for decades.
The thing is — you can’t make bread if you can’t mill the wheat to flour.
‘Manual’ or ‘Hand’ operated Flour Mills
The ‘Country Living Hand Grain Mill’ is one of the best, and it’s actually ‘Made in the USA’. I like the fact that it has a pulley so you can adapt another method of turning it other than ‘elbow grease’. It is expensive. But it will survive Armageddon and if Armageddon doesn’t happen it will survive many generations.
Electric Flour Mills
Note that a hand operated flour mill will take lots of ‘elbow grease’ and time to grind wheat to flour compared to an electric mill. For those who have the luxury of excess funds, you might consider one of each…
Two quality electric flour mills, both similarly priced:
NutriMill Classic Grain Mill
WonderMill Grain Mill

While we can't really speak as to which mill is the best choice, we can say that a hand-powered mill is less likely to break. Even if it does break, things which operate on simple mechanics, rather than electricity, are generally easier to fix for the general populace.

That said, old mills were often merely a round stone that you rolled like a wheel in a stone groove filled with wheat berries. Or they were a large mortar and pestle.

If you want, install a windmill or water wheel on your property to power your old mill. Then you can produce on a large scale, meaning you've now got a tradeable skill.

Thanks to Modern Survival Blog for these excellent tips — head over to their site to read more on the topic of survival food.