I have sitting on my counter the Krups Beertender I converted (http://www.instructables.com/id/Krups-Beerteender-Conversion/), but for the Superbowl I realized how non-portable this solution was. So I set out to find a easy and cheap portable tap that I could use from a cooler, counter top, or fridge.
After looking online, I found this: http://forum.northernbrewer.com/viewtopic.php?f=3&t=61167&sid=f054f78a221afd9740f0c31521c11bc4 , which really helped me with the basics and why not to use brass/copper. His design is pretty great, but I think I have been able to simplify and make it cheaper.
Step 1: Gather needed materials
I ran down to the local big box building store to pick this up:
2 1/2" threaded to 1/4" push to connect
1 1/4" to 1/4" push to connect
1 1/2" threaded to 1/2" barbed fitting
1 1/2" Brass Tee
Some 1/4" Ice maker tubing
1' Length of vinyl tubing (not pictured)
I think I spent just around $25 on parts (if that much).
You are a going to need a drill, 1/4" bit and an adjustable wrench