This is a bad idea. He will just acquire a taste for whatever “tastes bad”. This isn’t going to be some magic trick that nobody has ever thought of.

I was lucky enough to be able to quit without any programs, but in my worst, I was choosing things that were “harder to drink” because of their taste (like the most bitter beers I could find) so that I would “drink slower”. All it did was make me acquire a taste for really bitter beer and I drank as fast as ever.