One of the biggest things to remember is that ducks need extra niacin (a type of vitamin b) in their diet in order to grow and function properly. I didn’t know that at first and it was a huge mistake. I like to add nutritional yeast on top of their feed and it works nicely, since normal duck feed rarely has enough. I also like to keep the injectable vitamin b on hand that’s labeled for cattle but can be given in small amount orally in duck deficiencies and emergencies. I also always have a first aid kit full of all sorts of things like vet wrap, blue kite, vetericyn spray, antibiotic cream, gauze, saline solution, tweezers, a scalpel, and more (but that’s for my chickens and ducks). I also always keep a few extra dog kennels on hand for separating a bird if nessesary for many reasons. Also always have access to swimming water and deep pans of water for cleaning themselves and preening etc. I also always keep the crazy k duck boots on hand since I’ve fought bumblefoot a lot with my ducks. I’m writing this quickly so I hope I didn’t miss anything but it Hope this helps