What's the best way to share a Zotero collection (without creating a new "group" collection)
The following was posted in response to the OP's question on the Zotero forums:


  adamsmith Sep 14th 2015  
  
  Easier sharing of parts of your library is planned, but currently, unfortunately, the answer to all of your questions is no. The only way to share a collection is to drag it into a group and it won't sync with the original collection.