Is Food Self-Sufficiency Possible?

Food Self-Sufficiency has interested me for years. Is it possible to grow everything we need to eat a healthy and varied meals? What about if you only have an apartment?
Here are my thoughts:

This is the problem: We are products of modern days. A time when we could get in the car and drive 5 minutes to a fast food joint or convenience store. When we have freezers stocked with pre-made dinners, toaster waffles, and logs of ground beef. When our pantry is stocked with tin cans purchased, and not home-canned. When a quick meal means grabbing carbs and meat with little thought to fresh veggies and fruit. When we can eat an entire bag of chips or bowl of popcorn as we vegg in front of a TV. When dessert is cake or something sweet, instead of fresh fruit and homemade cheese.

What would happen if the economy got so bad that we couldn't afford to go to McDonald's or order delivery from Pizza Hut? Or Peak Oil happened so drastically that we ran out of gas? Or if the electrical grid went down from a EMP, which meant even grocery stores would be out of food within days, with no chance of restocking.

So how do make the transition to homegrown anything and everything?
I've discovered cold turkey doesn't work for me. Sometimes I have a migraine. Or my IBS is acting up. Or my autistic epileptic son MUST have his Cinnamon Life Cereal.

I just don't feel like thinking about what's in the pantry or refrigerator, or stored in jars in my closet.  I'm sure I'm not alone.

When I had my little farmette in Colorado with my husband, we had goats (milk and it's products, meat, income [sold cheese]), chickens/turkeys/quail (eggs, feathers, meat, income), rabbits (meat, income, "fur") as well fruit trees and bushes, and a large garden for veggies, fruits, herbs and greens.

We learned so much and put away a lot but honestly, we MIGHT have been able to survive for a short while on what we successfully grew.  But now? My son and I live in a small apartment in Kentucky. Yes, we have an outdoor patio, but how much can I really grow in this tiny "backyard grocery garden"? Enough to feed us if we have nothing else?

I plan to explore that in the coming posts.