if I live on an island will ducks swim far away from home?

[KonekoChan528]

I live in Wisconsin, on an island with 20 other houses. My fear is if I get ducks would they swim far away from home or will they stick around with their chicken friends?

I'm planing on getting 2 ducklings and 6 chickens. I've heard that they can be in the same coop, but i fear they will "swim away" also is there anything extra I should do to the coop to fit the needs of the ducks as well?

Thank you!