All summer long my horses get a dash of regular temperature water in their "treats." The treat bucket usually consists of senior feed, Strategy or SafeChoice or similar. Maybe with some carrots chopped in there too. So they have a slightly wet mash in summer.
In winter, I take a bucket of warm water with me and pour some in their regular treats. All of those things....senior feed, Strategy, SafeChoice, etc, makes a wonderful mash with a little warm water. And I feel like it helps get some water in them too, since in winter I worry about impactions and such.
So my guys get a wet mash year round, every evening. The only difference is the amount and temperature of the water. I make things more sloppy in winter because the extra water is good for them. In summer, I basically just get it a little wet and crumbly.
Yes, I enjoy spoiling my horses!
PS. I DO feed pretty much 100% alfalfa hay, but I am unsure how much bran would be safe to add to their diet to balance the calcium/phos ratio. Does anyone know what a safe amount would be to feed daily in an alfalfa diet?