https://www.backyardchickens.com/articles/duckling-care-brooder-ideas.64854/
You could also take them to the tub and put just enough warm water[always warm water] to cover tops of their legs at first. After they have been playing in the water for a few days raise the water level up to where they can swim underwater. you can place a heavy container upside down in the water to give them something to stand on in the tub if they get tired. Always supervise since ducklings can not keep themselves warm nor are they waterproof right off. Once they start bathing in water they will begin to preen and spread oils over their feathers[down] and begin to waterproof themselves. If you put water in their brooder you'll have a mess since they will splash it all out and their bedding will be soaked. They will imprint on you when they hatch. They will also imprint on each other and become a flock.
I don't use a bator my Muscovy hatch for me.
You could also take them to the tub and put just enough warm water[always warm water] to cover tops of their legs at first. After they have been playing in the water for a few days raise the water level up to where they can swim underwater. you can place a heavy container upside down in the water to give them something to stand on in the tub if they get tired. Always supervise since ducklings can not keep themselves warm nor are they waterproof right off. Once they start bathing in water they will begin to preen and spread oils over their feathers[down] and begin to waterproof themselves. If you put water in their brooder you'll have a mess since they will splash it all out and their bedding will be soaked. They will imprint on you when they hatch. They will also imprint on each other and become a flock.
I don't use a bator my Muscovy hatch for me.