As a voice major, I had a nasty creepin' crud that lasted for weeks, and set me back for a semester on my senior recital. My teacher & I did lots of research that semester. As a voice teacher & vocal coach, this is what I preach:

Absolutely no alcohol! It is very damaging to the vocal folds. (mouthwash often contains alcohol) No hot or ice cold liquids *when singing* as this constricts the vocal folds-room temp water is good. To soothe your throat by all means have some warm tea with honey, lemon, peppermint, but no alcohol. Say yes to humming in your "head voice" (oh I hate that term but it's hard to describe in type as the masque). Start on the 5th of the scale & go down, moving up & down your tessitura as it feels good. Try a breathy SSSigh- ) ) )igh (slide down about a fifth like a trombone singing on the word "sigh") I prefer to think of "Cy" as handsome cowboy-- & sigh over him! If it hurts, DO NOT DO IT!. A friend had the instructor across the hall from me. This friend became a beloved character on a soap opera (she's no longer on). She was taught incorrect vocal technique. That instructer often heard "but Mrs. ******, that hurts when I do that" from her students. This friend had vocal nodules, surgery, & mucho vocal problems. Seek out good professional training. Good Luck!