16- or 20-oz plastic drinking cups work GREAT! I use the slightly smaller styrofoam cups for mine, but that's because I want to fit a few more in the same tray.
Nice thing is, you can get a pack of about 20 of the plastic cups for under $2. Just drill some holes in the bottom and you're ready to rock.
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I could sail by on the winds of silence, and maybe they won't notice... but this time I think it would be better if I swim..
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