Hey there, I have a YAWYD steerer tube cap / beer bottle cap holder from Niner bikes. You can use it to put the lid of your favorite long neck (or short neck if it's Negro Modelo) right on your bike and give you a little motivation to finish the ride.
They sell for $12.99 at Niner, but I'll ship it to you for $10 with postage. Email me and we'll work something out. paul (at) nippleworks (dot) com
*This product can not be used to hold the champagne cork from a fine bottle of Belgian beer.