While my healing kit comes from another system, I have a core kit of a small coreless (throwing) knife in a sheath which I use as a scalpel for surgery, I have so many bandages (bought on eBay), a small jar of leeches (jar from Ikea, leeches from a supplier on the UK LARP Kit Facebook group), and a few potion bottles (I bought a huge bag of them) which I can fill with system-appropriate herbs / syrups.
When I get home, I will have to photograph them so I can show what I have.