The concepts of triage will change drastically WTSHTF.
I can tell you what I have in my med kit...a lot of it is for animals and is a mix of natural things and more modern medical things.
I have three sets. One is for "the road" and one is for at home, one at the BOL. The Road bag, has different contents than the other two. The Road kit is the only one that fits into a back pack and is only good for minor things.
Jerusalem bandages (money saving tip: horse bandages work just as well and are cheaper)
Chest vents
Scalpels
Fish Antibiotics
Lidocaine
Steroids
Gauze pads and wraps
Colloidal silver
Suture kit
Syringes (various sizes)
Various gauges of needles
Emergency Defibrillator
Stethoscope
Blood pressure cuff
Blood O2 saturation monitor
Albuterol
Zip stitch laceration kit
Iodine
Gloves
Hand Sanitizer
Rubbing Alcohol
Tripple Antibiotic cream
Chemical Ice packs
Chemical Heat packs
Anti-diarrheal meds
Tums (calcium carbonate effective mitigation against certain kinds of radiation)
Enemas
Drawing pastes
Yeast infection treatments (not just for women BTW/diaper rash, jock itch, sweat rash and some foot issues)
Blister treatments
Liquid Stitch
Band-aids and butterfly closures
Pain meds, mucus relief, cough meds and other over the counter "normal" stuff
Anti-oxidants (DIM, selenium, COQ10, etc...radiation mitigation again)
Topical meds for eye infections
Thermometers (NOT digital)
IV supplies
Sterile Saline
Braces for ankles, wrists and knees
Sling
Casting materials
Microscopes and slides
Blood typing supplies
Clotting powders
Peroxide
Finger leg and arm splints
Tooth numbing liquids and natural things
Temporary crown materials
I am sure I forgot some things...