As far as I know, it is a Chassidishe minhag, and the litvish will not do it. Sources, I don’t know. But according to the litvish you need a reviis of whatever it is. I never came across anyone willing to make kiddush on a reviis of whiskey but something tells me that wouldn’t fly for a litvak. As for havdalah, even the litvish are more lenient – beer is perfectly acceptable for that (though again, I have never seen anyone make havdalah on any amount of whiskey).
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