A Simple Contact Tow.
For our sea kayakers out there using contact tows, you don't need an expensive cow tail with carabiners or an expensive tailored bit of kit. Simply double up a sturdy bit of Bungy chord and attach to your deck line in front of your cockpit. Place one on either side so you can do your contact tows on either side. When you need to do a quick contact tow, just approach the bow of the casualty boat and attach your bungy to the toggle and paddle away. The casualty boat bow should end up somewhere just aft of your arm so be aware of the up and down motion.
It's a quick, effective and CHEAP method.