With respect to training, take a look at the Wilderness First Aid and Wilderness First Responder programs run by organizations like NOLS and SOLO. They go far beyond what you get in a standard Red Cross first aid course, and are designed to equip you to deal with situations in austere conditions, when EMS isn’t 5-10 minutes away. The WFA course is 16 hours, and the WFR course is 72+ hours. There are classroom and practical components, and you’ll leave with very useful ideas about how to build your kit and how to improvise when you don’t have the “street” equipment you might need. If you get the right instructor who doesn’t mind going off the record occasionally to share unsanctioned ideas that aren’t in the approved curriculum, you can learn cool stuff like how to get multiple doses out of a single epi pen.