This is cloudy water from the water fountain in the library on campus. I was disturbed by the white colour of my water when I filled my water bottle this morning, so I looked it up online. Apparently it's just lots of tiny air bubbles in the water. I let the water sit for a minute and the bubbles slowly dissipated, the water clearing from the bottom up. Cold water holds more air than warm water, so when it's colder outside (as it was this morning), the water is more likely to look like this.
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