This is a no brainer, but always bring some antibiotic ointment with you. But don't use it for too long. Here's my story:
On a short day trip once I had a mild fall, and cut the bottom front of my ankle. It was almost severe enough to require stitches but not quite. Instead, I decided to use the ointment and a bandage every day until it healed. After about eight weeks, it still had not completed healed, so I went to the doc. He explained that the antibiotic ointment does indeed help prevent infection, but using it for too long can actually slow or prevent full healing.
I promptly stopped using the ointment, and my cut was fully healed in about a week.
David in PA