No newspaper it can cause splay legs. too slick. Here is the link to caring for ducklings, it has a pic of a great easy homemade waterer that will keep them dry and your brooder fairly dry.
https://www.backyardchickens.com/t/750869/raising-and-caring-for-ducklings#post_10611711
https://www.backyardchickens.com/t/750869/raising-and-caring-for-ducklings#post_10611711