I don't think anyone here is kidding themselves that being self-sufficient will be EASY, and I know that life "as we now know it" couldn't be preserved without the society that currently supports it. The scary thing to me, is how few people have even considered how they would survive without all the modern conveniences they now enjoy. The majority of Americans would be helpless if the "worst" should happen. I, for one, don't intend to be helpless. Our ancestors managed to survive, but they had a multitude of skills that have been allowed to fall by the wayside as modern life has progressed. That knowledge and those skills are still available to anyone who truly desires to possess them and that, I think, is what this wonderful thread is all about.
I suggest anyone who is on a tight budget and is looking for good information on preserving food- check out the book section of your local thrift store. I have found numerous vintage cookbooks and how to books on things like cheese making, drying food, canning, bread making, etc. for less than a dollar each. I've accumulated quite an impressive collection of these types of books, so at least I won't be totally lost if we were to lose the Internet.
Back to chickens. My six Girls vastly prefer to freerange my yard. Since I only allow them out when I can be out there to keep track of them, their freerange time varies depending on my availability. On days they are out most of the day, the barely touch their store bought feed. If they are confined to their run all day, they clean out the feeder. I love to observe them, finding their behavior fascinating, and have noticed that they don't eat any one thing for long. The move all over the various areas of the yard, sometimes eating grass, or mulberries, or comfrey, or bugs, or seed heads off taller grasses, or my petunias... you get the picture. I believe that as long as you offer them lots of choices, especially by planting stuff just for them, they will naturally eat a balanced diet. It would, of course, be more difficult to provide a balanced diet in the Winter, but I'm sure it can be done.