My experience is that a chick tutor is beneficial with small groups of poults such as 5 or fewer and that for groups of 15 or more poults that a chick tutor is not necessary but also does not hurt having one. It does seem to be beneficial to scatter some feed on the floor of the brooder rather than relying on the poults to go directly to a feeder.
The only times that I put marbles in a waterer is for tiny chicks such as guinea keets or perhaps bantam chicks especially if they are confined in a small area which makes it easy for them to get pushed into the waterer. I am using the marbles only to prevent the drowning of the little ones not as an attractant.
I was hoping to only make sure and have chicks the right age for bring a tutor while hatching these first small groups of turkey eggs. I finally got to gather 3 eggs at once 2 nights ago. Since my slates just started laying also I should gave bigger groups of poults, I put 13 eggs in last night, four from the slates and the rest all from my RP.