Hi, me again!
To keep bedding dry, the water and food is out on the porch (wrapped on all sides with half inch hardware cloth, and surrounded by two strands of electric fence, same as the house, to which it is attached).
The floor of the porch is half inch hardware cloth under an inch or two of sand under an inch or two of sawdust, which gets stirred every day or two and replaced when it starts to get a little rich, before it has an unpleasant odor.
I'll skip the long story, but we don't worry about freezing water because the ducks are in the basement in winter.
However, I had bought a heater platform and some stainless steel water bowls before I decided to have a winter shelter for the ducks. Some people use heated livestock water buckets, there are submersible heaters for larger containers, too. It's just that electricity outdoors and dry shavings and bedding give me pause, as I am concerned about fires. That can happen if the wiring is not just so.
Now, many people just bust the ice, carry hot water out to melt it, and so forth.
But ducks need need need their water. And it's good you know that and can plan for it.