One of the best things you can buy is a "Red Cross First Aid reference guide"
Check expiration dates on all medicine:

• Adhesive tape, roll 2" wide
• Applicators, sterile cotton-tipped
• Antiseptics solution
• Aspirin (or aspirin-free tabs or caps)
• Bandage, sterile roll, 2" and 4" wide
• Bandages, plastic strip, assorted sizes
• Cough mixture
• Petroleum jelly
• Rubbing alcohol
• Safety pins, assorted sizes
• Sanitary napkins
• Scissors
• 1 pkg. paper tissues
• Needle
• Tweezers
• Thread
• Water purification materials
• Ice chest for medications requiring refrigeration (dry ice)
• Extra oxygen bottles (if needed)