Im new to mead, and I recently made my first batch. I don't really have the stuff to do it like a pro so I read on a guide that you can use a balloon while its fermenting, instead of an airlock so I did that. Turned it inside out,poked a couple holes in it,put it on, and let it stand. Went to look at it the next day and there were fruit flies all around it. None got in because of the balloon but I just dont like them being there. What is a good way to get rid of them?