It is vitally important that everyone be prepared for a medical emergency. A big part of this (and a good first step for anyone) is having a good first-aid kit to hand. While you could simply go out and buy a pre-made kit, it can be a good idea to custom make your own, especially if there are certain situations particular to either the area or the people that you will be potentially treating.
While I’m not going to go into the finer details of how to put a medical kit together, the video below does a good job of showing some great items to include, and some good things to keep in mind when putting a kit together. From what to include in the kit, to saving space to even what kind of medical bag to use.