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.