Or know an old moonshiner and get his leftover mash only problem is if the chickens act funny your rooster will not crow the next morning it's hell to crow with a hangover! Good thing if you feed them that a day or so before butcher time it does tenderize the meat!
I would add someDE but nothing else the birds love a dust bath I'm lucky some will make a dust bath hole in the sand then run over to the ash and bath again so it works great for me no mites!!
What's charcoal? I only use hardwood like oak and pecan!! Straight from the yard!! And never anything like starter fluid I start mine with a piece of paper and twigs in an open bottom can if I do use charcoals it's only cowboy charcoal
When I grill out I put that ash into the run the hens love it just let it cool first I didn't once had to put out a hen! She wasn't hurt but had a few feathers burnt. Use for the inside a water soluable paint cote a first coat with a mix of what ever you use to know lol the mites then when that...