Straw bedding, and pelleted sawdust in the watering station. It is the bottom of a large plastic dog crate/carrier. The sawdust absorbs water and poop. It gets changed out as needed, sometimes just the top bit removed, sometimes spot picked for poops and then stirred, sometimes replaced.
This is for drinking mostly, but when the temperatures are well below freezing, the ducks will splash-bath in it, and the sides of the watering station catch just about all the water and keep the bedding dry.
This is for drinking mostly, but when the temperatures are well below freezing, the ducks will splash-bath in it, and the sides of the watering station catch just about all the water and keep the bedding dry.