NO duct tape on my skin. Especially on the foot - all that friction rubs it right off. I've never successfully used duct tape in a medical application, it's either been sweated off, rubbed off or rolled off, and not on purpose. Leukotape stays on the skin for a week and protects the hot spot much better. If there is a blister instead of a hot spot, moleskin takes a beating, unlike gauze, and once taped in place it protects better. Cut a hole in moleskin, put over the blister, slap in some antibiotic, add a small piece of nonstick gauze, run a strip of leukotape over the hole, done. If I'm going to take just one type of tape instead of the sports tape, etc. it would be leukotape. I've repaired hydration bladders with the stuff - duct tape just slides right off a Camelbak.
Gauze is too flimsy for use in a boot but it's great for spots that aren't going to see abrasion and need to breathe. Roll gauze wraps on awkward spots like fingers or elbows, keeps things clean and hopefully dry, and an ace bandage provides a good level of protection - I was very grateful to have one because once wrapped around my hand I could continue using the hand in a limited fashion without worrying about re-injuring the palm.
And what's most likely to get injured, due to the endless things you do with it? the hand. What do you rely on the most other than your feet - the hand. Being able to get a cut or scrape clean, and hopefully mostly healed in a couple days, is important. Having stuff that works with a wound when it's wet, and some more stuff that protects it in later stages of healing, leads to a nice dry scab that doesn't need much attention and protects it from infection. It's 48 hours later and my palm has a two inch scab - already the edges are healing inward. Skin is fantastic stuff. No bandages today.