I would sell my house, cash out my 401K, sell my stock, and try to buy the biggest plot of arable land that I could within a 3 or 4 hour commute of my job with whatever cash I had ... Then I'd move in to my mom's house, and go into money saving mode.
During the week I would continue to work at my job.
On weekends, myself, and a few friends would go to the new property and build a fortress.
The money I manage to save between now and the depression would go towards buying supplies and building the fortress.
I'd probably manage to get about 40-50 acres in the middle of nowhere in Wisconsin ... I would plant some apple and cherry trees ASAP, I would also build a barn and machine shed. I'd pick up a used tractor, and I'd construct a still ... I'd get a rifle and PLENTY of ammo for it.
With stockpiles of canned/dried foods, as well as with hunting and crops ... a 20 people should be able to live off of the land pretty reasonably. With the still, I should have some moonshine with which I could barter. It wouldn't be fun, but friends and family would be safe.