As Ron suggested, what do you have in your first aid kit?
I have the following, for a very simple and basic first aid kit.
(just thinking off the top of my head, as i can't be bothered to get it out the car)
* melolin swabs (adhesive and non)
* surgical tape
* assorted plasters
* safety pins
* triangular bandage
* various gauze bandages
* adhesive stitching
* finger bandages
* antiseptic wipes in individual packs
* scissors
* support bandage/tubigrip (i have problems with my knees!)
also,
* antihistamine cream (for those pesky mosquitoes)
* sun-tan lotion (for when you're on a boat and the sun's hot - you don't wanna get heatstroke between dives )
Anything else???