Great, I will just do a fast run down. We have a little over 20 birds, and so we settled on a 2 gallon bucket. A gallon glass jar almost worked. If you have a bigger flock you might need a 5 gallon bucket, but less than 20 could probably use the jar.
I started by putting 8 cups of feed (2 yogurt containers) with 8 cups of warm water and 2 cups of starter. Let it sit overnight, you will see some bubbles on the side, just like with the bread sponge. In the AM I would take out about 8 cups to feed with a wooden spoon (which isn't everything in the bucket, because the feed swells so much). I would put in 4 cups or so of mash feed, or 2 cups of pellets, with 4 more cups of water to replenish it (it doesn't have to be warm water, but it helps it ferment further).
The process is very forgiving, and if you try it you will find what texture your birds like, and what is easiest for you in regards to water and feed amounts. I have no waterfowl, but I am pretty sure they will go nuts over the stuff like the chickens do. It smells funny to me, so I am always amazed they treat it like the greatest delicacy! They also aren't as reliant on water, too, and only drink it for thirst and not digestion.
Let me know if you have any questions at all. I'll check before I go to bed.
Good luck!