-chick waterer - The plastic 1 qt mason jar ones that others have posted above, is what I use. I've never needed marbles or rocks inside it but I've only raised standard sized chicks, which are less likely to drowning in them due to their size vs the waterer size.
-chick feeder - So I'm super cheap. I have the matching plastic feeder that's the same size/type as the waterer, but I don't even have the jar portion that goes on top. I just add feed as needed into the bottom part and let them play in it.
-brooder light - For actual light: the sun.

I brood outdoors with a "mama heating pad."
-medicated chick feed vs not medicated - I don't use medicated feed. I have had coccidiosis in my flock. My chicks are exposed to it as they're outside with the flock and develop immunity that way.
-chick grit - As I brood outdoors and can't control what the chicks are nibbling on, I offer grit from the start.
-treats or no treats - I begin offering small amounts of treats after about a week or so, to help the chicks get over their fear of my hands.