Most of the people giving you advice are also in the United States, so that means the stores they recommend will also work for you. If you were in another country, it would do no good to recommend US-specific storesUNITED STATES unfortunately

For Neosporin or any other triple antibiotic ointment, try Walmart or Target or CVS or almost any grocery store. It should be in the "pharmacy" section, probably near the bandaids. Sometimes there is a sign that says "first aid."
That is also the place to look for hydrogen peroxide.
The Poultry Nutridrench or Poultry Cell or something similar should be sold at almost any place that sells chicken food. For example, Tractor Supply has Nutridrench:
https://www.tractorsupply.com/tsc/product/nutri-drench-poultry-4-oz
You can select a store location near you (assuming there is one nearby), and the website will tell if that product is in stock at that location, so you don't waste time driving to a store that has run out.
If you want to order them online, Chewy is an example of a website that sells them:
https://www.chewy.com/bovidr-laboratories-nutri-drench/dp/355061
https://www.chewy.com/rooster-booster-cell-liquid-vitamin/dp/260018
Amazon almost certainly has them too, and so do many other places.
Online is not as useful if you need things right away, but can be handy if you want to buy something now to have on hand in case you need it in the future.
The Manuka honey that was recommended, when the poster says to look at "any health food store," that would be true for any such store I have gone to.
I remember that you already have neosporin, and I don't know how important the other items are, but I can at least suggest some places to find them
