This is just my situation, but a round of antiboitics is mandatory for me. If I get a blister and it gets infected, I'm screwed. I have diabetes, so low circulation in the feet is a problem. I could hike out wearing keen's, if the boot was causing the blister.
If you don't count sun glasses, clothes, sun bloc, sun glasses, bug juice, head net, a knife, as first aid gear, then after the antibiotics I'd take duct tape. I could make sterile dressing from a boiled t shirt, plus use it for splinting or as a band aid. #3 might be band aids.