I've got some chicks from a feed store that I bought in like 3 different lots. These chicks are from Mt Healthy. They all were robust and healthy when I got them but they take turns getting sick and dying. I didn't have this problem last year when I bought my first chicks. They were all healthy and stayed healthy and continue to thrive now with exception of some predator incidents. Is there a human type med/vitamin I can get from CVS to put in water or administer to chicks. I live in coastal town that is not agricultural in any way except with seafood. The nearest Farm Supply stores are two hours away. Thanks for any replies.