An ounce of prevention is worth a pound of cure. I have decent trauma care training. But thats dependant on having a facility to take someone to. The Wilderness medicine book has some great things that anyone with a little knowledge and forethought can ease suffering and help with common problems. The best part is they give a list of OTC stuff and uses that people may not have thought of.

With what you can get at Wally World you can do a surprising amount of stuff.