If some one really hurts themselves, a compound fracture for example, you are going to call for mountain rescue and ideally a helicopter. A nice big bandage can be used to cover it up so folks don’t have to look at it while waiting for help. You can make a sling out of it too. Warm clothing and an emergency shelter are good to have.
Polythene survival bag, cut open, foil sheet taped to bag is best. Try getting someone with the above compound fracture into a bag. Tricky.
As crikey says, you cant clean deep wounds properly on the trail, unless you want to carry real drugs, needles,syringes, sutures, dressing packs, instruments, huge quantities of dressings etc.
Get your injured folk to safety and proper help quickly.