My center provides the water bottle. The parents pay for it, it's part of their enrollment fee, so they get to keep if/when they leave the center. They're all the same bottle, so no fighting necessary. Due to the texture and type of plastic, Sharpie takes a while to come off, so we just write their names in Sharpie on them.

I use the clear nail polish trick on toothbrushes, though. I used to use masking tape, but everyone kept picking at it, so I gave up.

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