Is there a word/phrase that describes someone flinching after they sip alcohol?

Solution 1:

I believe the word you seek may be "wince". Let me add the word "recoil" which is also fitting.

"After taking a shot of sour apple whiskey, Gus winced at the overwhelming taste."

"After taking a shot of sour apple whiskey, Gus recoiled at the overwhelming taste."

https://www.thefreedictionary.com/wince

https://www.thefreedictionary.com/recoil