I too am prone to toenail problems and must keep them well trimmed and filed as suggested above. For me, I always have a high quality nail clipper with file in my kit. This is not a place to skimp on and get by without or some lesser substitute/multi-use item.
As for bandaging blisters/hot spots, try getting some Leukotape. It is amazing how well it sticks. I have put a piece of tape on a hot spot and find it is still there after a week of hiking, showers, stream crossings, etc... One of the best tricks I picked up from a you tube video was to get some sticky labels. Peel off the paper label and throw it away. Take the backing (the part you are supposed to throw away) and stick a piece of Leukotape to the shiny non-stick side). Trim off the excess paper and/or tape and you have an easy to pack and easy to use piece of Leukotape, ready to use. You can pre-cut into convenient sizes or use your scissors on your Swiss Army Knife to cut to size as needed.