When my duck was 10 days old, I dug a little hole in our yard, out by the irises and under the Althea tree. Covered it with a rabbit cage with the bottom taken off and drizzled the hose in it so it looked just like a little pond with a stream. My baby could stand up in it but really loved it! Of course, here's a video.
https://www.dropbox.com/s/qq8qtc026ysjlzk/Video May 10, 12 10 30 PM.mov
https://www.dropbox.com/s/qq8qtc026ysjlzk/Video May 10, 12 10 30 PM.mov