By the time they are a few days old they enjoy some supervised pool time. But be careful they water log quick without mom's oils to water proof them. Only give them a couple minutes to begin with then place them in a warm draft free area to dry off.
Enjoy! nothing funner than watching ducklings swim!
Yeah just give them a little bit of a bath time once or twice a day and make sure they get dried off good. They don't have any waterproofing until they get their feathers and they can easily drown if they get too tired.