Hi, I really have a problem. I feed my ducks free-choice using the 5-gal bucket method that pours out into a large bowl. But whenever it rains, the feed gets wet, and after a day or two, gets lots of bugs and molds. It is a waste of money and is unhealthy of the ducks, I know. I have tried putting a piece of plywood on top of the bucket to help keep it dry, but it always gets wet to some extent. I really need advice, please.