Mark Gillespie brought this to my attention, and you'll have to check out the site to see how they did it. A 105.3 Liter bottle of whisky filled with Tomintoul 14, and it will be displayed at the Clockhouse Restaurant.
Follow this link for a story from The Scottish Sun.
You can read all the details about how this bottle idea started from this website.
World's Largest Bottle website
Here is a photo (courtesy of their website and copyrighted by WC Imaging). The small bottle is a 70cl standard bottle.