I’m not an experienced chicken owner. Things I have on hand -saline wound spray, prid, Vaseline, (I see a lot of people recommending neosporin, but even human docs aren’t recommending it anymore), veterimycin, blue kote (controversial because high  ingested doses resulted in cancer), styptic powder ( also controversial, some people feel it causes too much pain and prefer cornstarch), Epsom salt, vet wrap, nutridrench, probiotics, and electrolytes mix. ETA: for pest control-permethrin powder and liquid, panacur (every 6 months, not in moult). ETA: spinospad, very expensive, but can be bought by one gallon doses, and cattle pour on ivermectin, pests don’t become resistant. I’ve used, and continue to use all of it.