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that the water bottle he brought in "had a high concentration of vitamin D," not KCl

That's very strange right there. Vitamin D is a hydrocarbon, it is completely insoluble in water. Vitamin D poisoning requires taking doses way in excess of 10K units for months on end, you aren't doing to slip a person that much through drinking water.

The only way to interpret the statement is that things are not as they are made out to be.

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He devotes a big section of the post to talk about water-soluble vitamin D, and decides upon investigation that there are such products. In his narrative, he also explains how he thought his water and food tasted weird.

i have 10,000IU vitamin D (they contain K, too, though) pills. they're very small. The same size as the 600-800IU ones - although instead of having an amber liquid inside, they're almost solid yellowish white. The medium is coconut oil, which explains both the solid and the color. Anyhow my point is, 10,000IU isn't a significantly "large" amount of the active ingredient. they're oval-ish, so hard to measure, but i think they're under 1/4" in all directions.

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