I took a premade wilderness kit and then added/deleted items I thought were useful.
Some stuff I added:
-no-needle srynge (like the kind you get at the pharmacy for free). It does a great job of flushing out sand out of the eye and dirt out of open wounds.
-ace bandage and SAM splint (you can use a SAM splint as a good neck brace or nealy any other kind of splint)
-Triangle bandages- slings, ties etc
-rehydration packets and water purification tabs
-diabetic sugar gel
I need to go through and replenish my kit from time to time as it does get used somewhat frequently. Also now is a good time to check expiration dates on items in the kit.
I also use my kit as a demo when I teach my Wilderness First Aid classes. Got another one coming up so I guess I better get to the re-stocking asap!