I think it could be any episode...And however the Vodka is displayed probably won't have anything to do with the actual challenges. The Vodka rolled out in October...The filming for Apprentice should have been completed by then. I'm sure there was a seperate filming in October that will somehow be advertised via the show. Based on that, there's no telling during which episode it could be shown.
Still...Sure it will happen...Just looking forward to it!