I think Scotch is one of those things you have to reprogram your brain to like. I actually used to almost like it. But I stopped drinking right before I started law school (no, I didn't have a "problem" which is annoyingly what people always assume) and now the smell of all alcohol, even beer, is just really unappealing to me, like cleaning fluid. Red wine and brown liquors are definitely the worst.
I love grapefruit juice and black coffee which I guess a lot of others don't like. But my vote is for shelf stable regular milk. Shelf stable chocolate or stawberry is tolerable. But regular tastes like plastic and corpses.