I used to make beer but quite making it and I'm slowly getting back into it (as the wife allows). My question is when I used to make beer my primary always had an air lock. Everyone said you had to have it or it would go bad. Now everyone is saying you can just use a primary bucket with a loose fitting lid. I currently have an apple pie cyser in the primary. Bucket with a loose fitting lid and 10lbs of honey on top just to keep it a little tight. What does everyone else use?