So I am going to invest in some 5 gallon buckets and make my own fermenters. I know this has been done in the past, well I need to know what size holes to drill for an airlock or grommet/airlock to fit in and where to get grommet if not available at my lhbs, but I think it would be. Also if I chose to stick a universal carboy bung in it instead of the airlock, what size would I drill ?