I'm new to ducks. I know that they need to dip their bills in water when eating, but is it possible to use the nipple style waterers, like I use for the chickens, in addition to their tubs of water? Their water gets dirty so fast, I was just trying to think of an additional source that would always stay clean. Would ducks learn to use a nipple watering system or would they just ignore it? Has anyone tried it?