I don't think telling you what is in my kit would be as useful. I'm not a Dr. and most of my kit is centered around first aid and is a combo medical / survival kit for a SHTF scenario.

I could ask my PA daughter and MD son in law what they would put in a vehicle kit, but I'd probably get 50 questions back because they'll both want to over analyze it.

My Kit:

TQ - Surgical scissors (Large & Small) - thin and heavy nitrile gloves - N95 Mask - Burn Free Burn ointment - Liquid bandage - Band aids of various size - tweezers - clot packs - Gauze - Anti-biotics - surgical tape - Advil - Signal Mirror - various small tools, including a mini socket kit - Emergency blankie.

The burn ointment has found the most use of the items in my kit.

I like Chuckster's idea of an EPI but don't have any allergies in my family so it probably isn't worth the bother for me.