The following items should be considered when outfitting a basic first-aid kit:
1 elastic-roll bandage
Aspirin or ibuprofen
Adhesive tape
Alcohol swabs
Antacid
Antihistamine
Antiseptic ointment
Adhesive bandages, assorted sizes
Bug repellent
Bulb irrigating syringe
Butterfly bandages
Chemical heat and cold packs
Dry-wash pads or wipes
Diarrhea medicine
Gauze pads, 4" X 4"
Hydrocortisone cream (soothes allergic skin)
Mirror, small and unbreakable
Moleskin, 1 or 2 packets
Cotton swab, sterile, packaged in pairs
Safety pins
Scissors (Swiss Army Pen Knife has scissors, small blade and nail file)
Sunscreen
Lip Balm
Triangular bandage
Tweezers
Emergency Blanket
First Aid Cards
Watertight container (for kit)
You may have other item's that may be essential for you, considering climate, current medical conditions (diabetes, allergies, etc.) and duration of stay away from medical help, but this list should give you a good starting point. In addition I would suggest that you have at least some first aid training, beyond high school.