I'm feeding an all purpose poultry pellet and topping off the second gallon with a little bit of alfalfa pellets ... maybe a pound of the alfalfa to the 11 lbs of poultry pellets.
I mix this together dry, then I mix it again as soon as I add the water, and keep mixing every few minutes until it is starting to absorb water. The alfalfa pellets are huge, and they absorb a lot of water, and they require more mixing to incorporate them. I'd prefer to use alfalfa meal, or smaller alfalfa pellets. But the feed store had the big pellets, and I can manage them okay. Then I leave it for a while, and when I feel like mixing it again, that's when I add the extra 1/4 gallon of water.
I'd also love to be working with a "mash" vs a pelleted feed. Maybe during my next feed tweak I'll find a mash ...
I mix it really well that first and second day until the alfalfa is distributed. I keep it in my kitchen so I can mess with it frequently.
I'm feeding about 130 birds total. But some of those are ducks and haven't been invited to the FF party yet. I have about 110 birds in the GenPop. They are devouring the 5 gallons of FF ... they also get scratch (dry, tossed in their litter and some out in their pasture) as I'm using a higher protein pellet.
I'll probably start being more deliberate with the quantities of scratch so I have a closer estimate about the base-line protein percentage in their diet.
I think the universal tidbit from my experience is that a 5 gallon bucket is good for fermenting about 12 lbs of dry feed.