I just use plastic trough type chick feeders for each cage. Never use galvanized feeders for fermented food, the acids can leach zinc! The wet clumping nature of the fermented feed prevents wasted food, something quail are notorious for! I mix a bit of older FF with each new batch so it's inoculated with the good bacteria. When it's colder just use more of the older FF to jump start it. I just keep a running batch and add to it unless it gets funky in smell or mold growing on top. I do add kefir or yogurt to the FF a few times a week. Just start doing it the way you want and develop your own system. Everyone has their own way of doing FF and their system will work for them with tweaking it now and then to suit number of birds you have at the time and the type of feed you use. Start with what you think they will eat in a day and adjust it as you see how it works. It can vary with how wet your feed is, whether your hens are actively laying, and cold weather. These can make them eat more than their opposite conditions.
Yes I start chicks out on it. I give chicks both dry and FF but they greatly prefer the FF and the dry is just the back up if they eat all the FF before I can refill their feeder. The dry food can sit for a week without being touched.
Experiment, see what works for you. You don't even have to start them all out on it. Try just one or two groups so you can see the amounts they eat and what you need to serve to them. Then you can multiply that my your number of birds. I'd love to hear about your results!