Can anyone identify this bottle?

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Picked up this bottle from a dentists home estate sale. It's larger than a sparklett bottle and has marking on bottom of DOT -M NRC 1987. I'm not going to drink out of it but not sure what it is
can anyone identify this bottle, repurposing upcycling, There is some white film on the bottom of the bottle
There is some white film on the bottom of the bottle
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