Yes this was from experience. I do not gossip.
There is not a dumb question. I am not sure if the gravity thing would work,,, I make feeders from pvc pipe and it works great. You dont want to use metal as the vinegar will destroy the metal and make teh food toxic. The feed will expand with the water. I use a method that is alittle thicker. I do not use a bucket with holes set in a larger bucket like some use. If my mixture is too thin I add alittle dry feed to it as I serve it. This is just a way I found works for me. There are so many ways to do it.
http://naturalchickenkeeping.blogspot.ca/p/fermented-feed.html this one is a great reference.