It is a good idea to keep the hen in small coop all by herself. This prevents any disruptions to the nest. For the larger species, breeds such as Orpingtons and Plymouth Rocks make good mothers. Despite the incubation period of 21 days in chickens, I have seen these hens set and hatch waterfowl eggs with incubation periods of 28 days or more. When the chicken leaves the nest to feed, it is good practice to mist the eggs with a spray bottle since most ducks will carry water back to the nest on their feathers, and chickens will not.
Call ducks are fairly reliable sitters and can be used to as foster hens.
Like the bantams, be sure to seperate the hens from the rest of the flock. We have also used domestic Muscovy Ducks for the larger species such as geese and shelducks. Muscovies are one of the best mothers of all domestic ducks and highly recommended. When using foster hens, make sure all the eggs you place under the hen are of the same size and of the same incubation period. For example, don't place teal eggs in the same nest as mallard or pochard eggs, the larger eggs will crack the smaller eggs when the hen rolls them.