I want to give my chickens Tylan 50 injectible for CRD. I have read that you can give it orally. Considering I have 58 chickens, the thought of giving it to each individual is a little daunting. Is there a way to put it in their water? If so, how much to a gallon? Is it okay to give them ALL the medicine, even though not everybody is showing symptoms? I looked for Tylan powder, but couldn't find any. (I am planning to order off of Amazon.)