I'm starting an Apfelwein today and was going to use a 5gal carboy I borrowed form a friend. I don't have any bungs that will fit it, and quite frankly, don't want to go to the hassle of running around town looking for a rubber stopper that will fit and drilling it out. I've heard of people just putting foil around the top, or using a balloon with a little hole in it. Will this work? $2 is $2!