A first aid kit, particularly when you're in the back country, is essential to attend to any injuries your horse might suffer. A standard first aid kit should include:

• A saline solution for cleaning wounds
  
• Nitrofurazone soluble dressing or bag balm
  
• Pytenol Lotion or Blue Lotion (mild antiseptics)
• Scarlet Oil for large wounds (not to be used on joints)
  
• Nitrofurazone powder for drying wounds
  
• Cotton and 4"x4" gauze bandages or sponges
  
• 4" or wider gauze wraps or vet wraps (Ace bandages)
  
• Banamine paste for colic
  
• Phenybutazone for pain and to ease joint problems

These are just the basics. You may want to add other items, but every kit should at least contain these items.