This will be my first year as well but check out the FAQ section on the dld website, it helped to answer most of my noob questions. Here's a quote directly from the website with regards to bottle sharing:
"CAN I BRING MY OWN BEER?
We allow people to bring limited amounts of beer for trading...
Here's a picture of what they look like. From my research they come in either one piece designs or they come with all the components separated. I'm not choosy on which style.
If you have a Sanke to ball lock converter (liquid and gas post) and/or a 90 degree elbow (attaches to top of Sanke tap to make it lower profile) let me know.
You may have found your answer by now but if not, it appears to be the danby DAR044
Here's the link to one at ABT Electronics http://www.abt.com/product/86255/Danby-DAR044A5BSLDD.html
I welcome any and all feedback Barrooze, especially the kind that makes me a better brewer! Thanks for the tip I will definitely use sanitized foil or foam next time. Cheers