It's good to keep a bottle of some kind of wound spray on hand. There's several different ones that people like, I personally have Vetericyn because it's what I was taught to use on my horses, and it works for poultry as well. I also keep a few rolls of Vet Rap on hand, which I've never used for either the horses or birds, but just in case I need to wrap a wing or leg or something, I'll be prepared. Otherwise, I don't keep medicine, but did research electrolyte recipes on here, just in case I ever need it; I always have those ingredients on hand. I've had good luck with my ducks though and haven't needed to doctor them so far.