With my ducks and chicken together I provide the standard 5 gallon waterer but also I keep a rubbermaid tub (the kind people put stuff under their bed with) and fill that with water, usually change it every other day. Because the poultry waterer doesn't provide the dunking duck-faces need. They not only clean their noses but they also use it to comb through their feathers. My ducks get dirty quick and look like gross little refugees if I don't provide them with water c_c Kind of like my chickens and dust baths.
I don't think its a crime if you don't make it a daily option for them as far as providing an actual pool... I mean, some coop set-ups just don't provide for that. And I've heard a lot of stories of ducks swimming until they are exhausted and dying, or chickens falling in and drowning :\\
As for freezing water I work and the birds are my responsibility so I have to make sure they have water before and after work, and before bed. I can't do much better than that so we'll see how the winter goes. Luckily for me my coop is all of 12 feet from the house. If I have to drop PVC pipe in the ground and run electricity out there I will, but I'm avoiding it.