1. I'm not a doctor or a health-care professional. You need to take training yourself and discuss with your trainers and healthcare professional about building out your own first aid kit.
2. I am a brand ambassador for MyMedic, however, I have been using their equipment prior to being a brand ambassador. If you click the link below to their website, I will get a percentage of the sale - which I appreciate.
I've always been a hiker. I started out hiking as a kid sauntering through the woods near my home in Northern Texas and hiking around places named Cougar Mound, Queen's Peak, and what had been the world's largest white leghorn chicken ranch that covered over 350 acres. The ranch was the best, there was a pond, old abandoned buildings, and tons of stories we would tell each other filled with legends. I started to do this almost daily either by myself or a good friend of mine at the age of 8. My first aid kit (FAK) at that time, and yes, I normally carried something, consisted of a pocket knife (that I would use to whittle more than anything and a few bandaids and rarely gauze.
As I became older and more experienced, my FAK changed. I started out with the FAK you could buy at the grocery store, and then your local outfitter stores. However, it was in 2009 when I attended my first Wilderness First Aid (WFA) training by SOLO Schools that things started to change.
It was 2009 that I started hiking the 4000-footers in New Hampshire along with my son. In addition, I would lead hikes with friends, and sometimes the kids would easily outnumber the adults. This is actually want drove me to attend the WFA training.
Fast forward again. Today, I have even more experience as over the past decade, I summited my first 10,000+ foot mountain, I took up rock climbing, over-landing, backpacking, and attended additional WFA courses both through SOLO Schools and NOLS.
I have two FAK that I use today, depending on the length of the trip and the number of people that are going with me. If it's only me and I have my day-bag, I bring my NOLS Med Kit 4.0. If I'm going on a longer, or with more people, or even offroading in my Jeep, I bring the Advanced Recon FAK by MyMedic.
Now, in both of these bags, I have added a few items to them:
Nitrile Gloves (some people are allergic to latex)
Zantac (H2 antihistamine blocker)
Benedryl Quick Dissolve Strips
Tick Remover (after all Lyme Disease is prevalent in New England)
You can spend countless hours on Reddit, YouTube, etc. looking at building your own FAK and determining what to put in your kit. That all said, start out with something that you feel comfortable with for the size of group you will be with and learn how to use the equipment. As you become more experienced you can add and remove items to your kit.