I personally have had thought about what's best way to down it without vomiting and i think just like a shot, less contact as possible to mouth parts and just putting it in throat, i don't know how to put it in words, just like rising my head and just aiming in throat to touch less surface as possible, and then swallow it as fast as possible, then have some other drink quickly to drink after, without breathing in process at all, that process always worked for me, with hard alcohol mainly
Process : rise my head up, aim drink in center of throat and no breathing at all in process, breathing substance mainly with nose always triggered me, holding my breath as long as possible while drinking water afterwards, and then deep inhaling first, and then exhaling with mouth only, not nose