I raise baby ducks all the time. I don't give them extra anything, so long as I use waterfowl or gamebird starter, there are never any problems.
I use cleaned milk jugs for waterers, as they are very messy. Just cut 1.5" x 2" wholes just high enough that the babies can get their heads in for drinks. this keeps them from soaking their brooder floor. It will still get wet, but not near so badly as with open containers. I also brood in boxes, and change them every day or two, depending on mess and stinch. LOL
Get them, sounds like a deal.