For our adult ducks we cut out 2 squares at the side of a large round plastic tub with a lid, they can get their beaks in for a drink and no spills. Tried the hemp bedding, auboise bedding, some other hemp like stuff that l cant remember the name of, straw and shavings. For ducks the hemp type stuff we found had a revolting smell when the ducks poo in it, costly to buy and a good wind throws it about if not in a sheltered hut. We finally settled on wood shavings as more cost efficient with straw on the top that we chop up to go further. You will have to experiment to see which suits you and the ducks.