Lol I know someone that has ducks and geese and the only thing they swim in is a oil pan that he puts water in. I would assume they arent dependent on water but like it since they are adapted to it and all. It sure is fun to watch them dive though.
That's one of the reasons I won't be able to get ducks is because of the water. I already said that I would keep it clean,and empty it everyday. There is a pond right next to our house so I can take them out daily to have a swim.
They don't need it-but would be very unhappy without it. They will need to have water deep enough to dunk their heads in, and might end up swimming in the water dish....
Mine have 2 wading pools that are emptied and refilled daily. They are funny though because they will go for any water. The dogs water dish, the footwash for the kids pool (high enough to be duck resistant), any mud puddle.... you get the picture. They are too funny. I love my ducks