You will most likely never need anything, or only simple supplies you keep for yourself such as wound cleanser and Neosporin. You might get some BluKote or other anti-pick remedy; BluKote is also a wound antiseptic. Wormers would likely expire long before you needed one. If lice / mites appear, and you check them periodically, you should have plenty of time to get to the store. You could get some Corid in case they develop cocci, depending where you live and how wet your conditions are, but it is not cheap, and many (including me) have never had to treat for this.
You can find page long lists on here for this, but with a little luck, you will never need a thing.