i was thinking;
sterile patch thing
Just use sanitry towels, you’ll never get a wound sterile out in the/a field anyway and these are cheaper.
small strip of plaster, cut to suit for blisters
I’ve never had a blister in years of riding that needed treating. But I will next week, sods law.
alco-wipes/antiseptic
see sterile patch. If you carry water in your camelback you can use that to get the worst off.
some pills- most over the counter medication isn’t strong enough to deal with real pain,just discomfort. I’d look for alternatives if some one was complaining of sore joints or muscles before giving them an ibuprofen and letting them continue. Headaches out riding are often dehydration or lack of sunglasses so try and treat the cause.
I would be more concerned by hypothermia in winter and dehydration/heatstroke in summer than anything else.