Maybe I am just old fashioned, but I prefer smoke signals. You should be able to carry enough wood, matches and lighter fluid in your jersey pockets to send at least 6 smoke signals.

But, you may not be equipped to start sending signals right away. You will need to get a set of aerobars to act as the fireplace grate. Also, if you need to send more than 6 signals, you can make more room in your jersey for wood by just putting the lighter fluid in a camelback. Just bite, suck, and spit your way to communication!