Tracydr, first, I want to congratulate your on your goals of a drug free flock. The simple fact is that the chicken survived thousands of years, both feral and in domesticated flocks without the pharmacological approach. I know lots of folks here use lots of drugs. That is THEIR decision and not one I deride. I repeat, it is their choice. On another thread, right now, someone is assembling a recommended "shopping list" of chemicals to give their chickens.
Here's one person's list:
Tylan 50 injectable (antibiotic)
duramycin 10 powder packet (antibiotic water soluble)
corid (to treat coccidia)
wazine (dewormer)
ivermectin 5% pour on (dewormer in the cattle section) good for mites and some worms
Maybe some water soluble vitamins like chick saver?
Here's another's recommendation:
Corrid
L-S50 (this is much cheaper at our Southern States) not even sure
TSC has it
SafeGuard
Ivemectin
Electrolytes unless you can get those at home
Tylan
Tylan
oh and Tylan
Sulmet (liquid)
Eye antibiotic ointment or spray.
And on and on.
I am not sure, not sure at all, but it is hard to imagine a commercial, "factory" hen being administered as many drugs. I realize I am on thin ice here. How are the home flock's eggs/meat going to be substantially different or any more healthy? Just an observation. The home folks can do as they wish, as can the commercial farmers. Better living through chemistry. More power to them.
That some, as yourself, choose to march to a different drumbeat? More power to them as well. Best regards.