It gets really tempting when it gets really cold to just throw out some dry food for them and not mess with the mash. But my peas just don't drink water, and if I feed them mash I know they are getting hydrated. I also like giving them a nice warm breakfast on cold mornings. Every five gallon bucket of mash has over two gallons of water that if they are going to eat they are going to get that moisture.
My estimate is that every bird get at least seven ounces of water in their food. I still provide water, but it feels like a waste of time and effort. The contained peas all have heated dog bowls and the freerangers get the ice knocked out of their rubber bowls and refilled fresh or they can go down to the creek and drink. The creek never freezes completely over.
It never ceases to amaze me how much volume I get from wetting the dry feed. You mentioned that fermenting raises the protein level another twelve percent, do you ever get concerned about how high your protein level gets? Some posters here have made that concern in young developing chicks. I figure my feed, not counting the extras like mackerel, bananas, fresh veggies, etc. to be right at 25%. If fermenting adds another 12% that brings it up to 37% ?!!! Well, they look fat and happy and the plumage is brilliant, and no one is limping.....