I just nailed a tiny cup to the brooder wall and kept some grit in there all of the time. None of them overdid it and all of them ate grit (and bugs). FWIW, I didn't buy grit because I have a granite scrap driveway and granite scrap is what is used to make commercial grit. I just grabbed a steel mesh strainer and shook a scoop from where the finer bits wash when it rains through that strainer. The stuff that fell through went in the cup.
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