I'm relatively new to chickens (three years). As I read different posts, I see medications and supplies (oils, salves, etc) that people use. What meds/supplies should I have on hand for when I have a sick bird? And where do I get them? Catalog/online chicken supply sites? I shouldn't wait till I have a problem and then try to locate a drug that takes a few days to be shipped. I should already have remedies here.