This is my first winter with ducks. I only have 2 call ducks, and I've got them in their own little "duck coop" inside an outbuilding that I've converted into one huge chicken enclosure. What is the best bedding/litter I can use for them this winter? Is there ANYTHING that will absorb the watery mess that they make? I don't mind changing the bedding 1-2 times/week...I just can't stand all the cold wetness in their coop.