Mine don't make any dust. you can let them eat/drink 24/7. When mine were 6 dats old they wen't for their first swim. Don't get sad/mad if they don't like it (You can try adding peas to the water, and they LOVE that!).
There is a LOT of other stuff I would have liked to know before I got my ducklings, so I will try to post some things that can help.
1. When giving you ducks their first bath, don't use the sink (They get good enough footing to jump out, and spill it all over your bathroon.
2. Don't worry about the whole watter added to food, mush stuff. Just buy some regular duckling crumbles, and leave their waterer near by.
3. you can give them a bath when you think they are ready for it.
4. Once you give them a bath, try to give them one daily because mine keep getting crud stuck in their nose.
5. If you ever need a book on help I recommend this one: The Ultimate Pet Duck Guidebook, By Kimberly Link - 222 Pages
from-
http://www.metzerfarms.com/BooksAndEquipment.cfm?Category=Book&CustID=240014
6. Be very careful about predators (And noise... I don't know what it is, but when my ducklings hear the garbage truck, they run to me for cover).
7. Hold them everyday, and cuddle, talk, sing. It makes you imprint on them, and they LOVE it!
EAT: OH and they ADORE peas!