Sneezing ducklings

[Amurr]

I have two of three ducklings that are about a week and a half old that started sneezing yesterday.
sneezing more today.
I know there is something I can add to their water- but for some reason I can’t remember the name of it. Help jog my memory? I’m heading into town today (a two hour round trip) and would like to get what I need while I’m out.

 

[sourland]

Do they have a water source deep enough that they can submerge their head and nostrils?

 

[Amurr]

Do they have a water source deep enough that they can submerge their head and nostrils?

No