Chain repair on the road

Carry a spare chain link (or better, two, with an inner link portion attached) inside your handlebars. If you have a chain-breakage, you may need to remove side-plates, don't bother carrying a link-remover. Force the blade of a penknife behind the plate to get it off.

Emergency Tire Repair

If your tire has been damaged, it may be possible to construct an emergency tire boot. Paper currency can be folded over, and placed inside of a rip to protect the tube. Do not ride this configuration more than absolutely necessary, and replace the tire as soon as possible.

Stay clean

Take latex gloves to wear in case of needing to maintain your cycle on route. Punctures happen miles away from washbasins.