The goslings have so far been my favorite. They are a few weeks old and are currently grazing on grass outside. Because they were born in the incubator, and I guess because my voice was the first one they heard. I can call to them and they will come running, peeping the whole way.
We started them out with a commercial starter/grower, being careful that it wasn't medicated. They can get messy with water, so I watch and limit the water a little at first. A wet, chilled gosling can easily die. I use a 1/2 gal chicken waterer, filling it up 1/2 way.
By 4 weeks they are outside forging for themselves. I bring them in at night. Even if I get them after the sun has started to set, all I need to do is call, and they will come running.
As with ducks, they are not ready for any swimming until they get their adult feathers. They have a shallow pan (as you can see in the picture above) but also unlike ducks, they don't seem to be too anxious to get water all over themselves.