I'm here too from BYC. I'm also not Officially Organic or Fully Self Sufficient by a long shot, but am trying to point my feet in that direction. I have thirteen Red Sussex Cross pullets in a coop, with a Not Quite Officially Big Enough run which I swear I will enlarge as soon as my intermittent day work slows down. Meanwhile, they're still getting used to the idea of going outdoors in the first place, so it's not a big emergency as far as they're concerned. Coop or run, they are healthy, active, inquisitive and friendly.
"Town" is a four-hour round trip for me that I make once a month, but the feed store there does stock organic feed, bless them. It's expensive, but I reckon I can break even on my expenses and still have free eggs for myself, if I sell large brown eggs from happy hens, almost organic, comparably priced to the free range eggs from the store, but fresher--the affluent summer cottager types around here seem interested in supporting local enterprise.
I don't grow grain here, as this is a small town-sized lot, though the thought of tractoring on my absent neighbour's overgrown yard is tempting.
Or maybe I could harvest the seed heads of all his grass. I do have a vegetable garden for my own benefit, and tons of volunteer dandelions and lambs' quarters, pineapple weed and rose shoots, all of which go down well with the ladies, who are now teaching themselves to shred things into beak-sized pieces.
Next year I'm planning on raising meat birds for the freezer (yes, I know they don't breed true, so are not sustainable per se) and the following year, I'd like to try some straight run Rhode Island Reds; hoping for half for meat (cockerels), and the other half (pullets) to replace the retiring Red Sussex hens. Then I will have a sustainable flock, if I keep a roo. Yes, it would be nice if everything was sustainable and self-sufficient immediately, but I'm thinking five-year plans, etc. Rome wasn't built in a day, and it'll take more than a day to unbuild Rome, as well.
I also notice they sell whole wheat (unground) far cheaper than whole wheat flour is sold at the store (a shocking price). I'm wondering if it would be worth getting my wheat at the feed store and grinding it myself, as I go through lots. Same question as for oats: unwanted "extras"?
I'll just have to comment on how my parents feed theirs. Basically, not organic feed. But when I move back there I'm going to talk to the feed store, which is a small family business, about possibilities. Maybe they can order some for us? Also, we feed all kitchen scraps except a bit that goes to the compost. All weeds (and there are MANY) and all grass clippings. We haven't used fertilizer in years. Oh boy is the pen quiet when we dump the grass bag into the pen. We've never had a need to put them on meds. We only keep a few. No more than 10 chickens, and sometimes a couple ducks.
But we keep ours out in the barn, so I don't. We can get organic oats from the food co-op through the church - a 50# bag cost about $28 last spring. I haven't bought one since because I'm on self-imposed budget restrictions this summer. 
Try to "search" for a recipe..I think there are many to choose from. 
