An interesting piece on winter feeding just with fondant, and a moisture quilt to ensure it doesn’t dry out; which also retains moisture from wintering bees.
I quite like the model of using the moisture for a purpose rather than just seeking get rid of it. As I have experience bees struggling with hard dried fondant before I can see sense in the model.
http://www.honeybeesuite.com/how-to-use-a-quilt-with-a-candy-board/