[jarenmf]

most needs for such water are for calibration of instruments - many labs run stable isotopes measurements which has many applications from tracing how plants use water to measuring your metabolic base rate .. so the main use case it to calibrate instruments because it's really difficult to have an absolute measurement of stable isotope ratios from first principles - and the ratios are so small you typically express them in relation to standards like VSMOW

[pseudohadamard]

Just remember that if you decide to brew up a cup from VSMOW you have to do it in strict conformance to ISO 3103.

[perpetuallunch]

I prefer my tea brewed with SLAP, or more recently SLAP2.

[lstodd]

I wonder what's the standard for ethanol and, therefore, vodka.

[pseudohadamard]

Oh, that one's easy. I'll leave it for Qualified Russian(tm), Boris, to explain: https://www.youtube.com/watch?v=IivdU8l1NOg