My Homestead First Aid Kit

[Denim Deb]

I use them for horses. Got a really strange look from hubby once when we were putting a diaper on a horse's hoof and I told hubby I had to help someone put a diaper on their horse.

 

[WendyJ]

 

[tc556guy]

Pepto may work for you, I prefer Imodium.
I would add moleskin,
some sort of soft flexible split like a SAM splint,
more sterile gauze...if you ever have to use it, you'll be amazed how much you need and how fast
Since its going to be a group kit add some comfort stuff like sunblock and bug spray that while not purely medicinal will be something that your younger or more unprepared campers will be truly miserable if they get fried, and that'll ruin it for everyone. At home feel free to leave it out
Since you're creating a general kit for a group, the female members might appreciate stuff like Midol