I live in Missouri and am worried about my chickens water from freezing in the winter. I have a Farm-Tuff top fill waterer. It's like this one and I don't want to buy a $40+ waterer for 2 months of a year. I heard that if I put ping pong balls in the water it would keep the water from freezing because the wind would move the balls and keep the water from freezing. I'm not for sure how this idea would work though so I'm asking for your guys imput. Thanks in advance.