In addition to all the suggestions here (some contradictory I know), it wouldn't hurt to take a first aid/CPR class from the local Red Cross. Better yet if they offer a wilderness/backwoods version as well. I know OP mentioned doing his tour solo, but while CPR is tough to perform on yourself, the classes do cover some self-rescue techniques e.g., abdominal thrusts (formerly known as the Heimlich Maneuver, until the Heimlich family wanted royalties). Plus, it never hurts to be prepared just in case the person needing help isn't you, but someone you know (or even someone you don't know).