First aid kits can be purchased from horse stores, but they can be pricey. A first aid kit can be easily compiled at minimal cost. It is a good idea to keep two first aid kits. One should be kept in the barn or tack room as the primary kit and should be easily accessible in case of emergency. The second kit should contain the bare essentials and be portable so it can be taken on rides.
Note: The original article can be found at the Colorado State University Extension.