Feed chicks as much as they want! I can't tell you whether that will be a cup or a quart or what. Watch your chicks. If they are hungry they will not relax, they will be pacing and scratching almost all the time. If they are well fed, able to eat and drink when they want they will spend time preening, resting, generally exploring for bugs and such. And if you provide something so they can learn to roost, they will experiment with that as well. I always use a large plant saucer or metal dish for their food. Yes, they scratch some out and yes, they get in it and sleep and poop, but I am not worried about waste at this point. They need to eat and as much as they want. Later when they leave the brooder I let my adult chickens in to eat the food that was strewn around! So nothing is really wasted! Good Luck with your chicks!
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