I think it's great you are working towards self-reliance. It's a skill that is lost on most people, including myself. I had a look at the issue some time ago. It seems that clean water is a major consideration, not just food. Many people keep 55 gal drums in their garages, water collection systems connected to their gutters, racks of canned food on their pantry walls, dried food in jars and mylar bags. It takes a lot of work and maintenance to stay prepared for the worst.
I suspect most people are not prepared and wouldn't be surprised if most people have only three days of food. But if you live in the city or the suburbs, once your neighbors start starving and see you're not starving, they will be kicking down your door.
For me, it's just living, not so much preparing for anything. That's partly why I dispute this three day notion. People--and Americans, especially--tend to accumulate stuff--and this includes food. And considering the size of American homes, and kitchens, well...