Taste aside, is it safe for drinking? Whiskey that was left inside a stainless steel flask?
Storing Whiskey in a Flask – Is Whiskey Safe in a Metal Flask for a Month?
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Best Answer
Whiskey is quite high in alcohol, on the order of 40% by volume, and is not hospitable to pathogens growing.
The flask is intended to hold liqueur, and so is made from or lined with a food safe material, such as food grade stainless steel (assuming you have one from a reputable manufacturer).
So yes, it should be fine.
Remember: when it was distilled, the whiskey was probably held at different stages for long periods in a stainless steel vat.