Maj.Nick Danger
I'll Lock Up
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If your flask is made of the common 18/8 variety of stainless, (18% chrome, 8% nickel) it should be non-reactive with most everything but the strongest of acids. Alcoholic beverages should not be bothered at all by good stainless without too many impurities. I have doubts about Chinese made stainless though as it can sometimes contain impurities in the form of other undesirable metals such as lead and other heavy metals.