What are your methods for removing mucus in your throat?

A month ago, I started online lessons with the best vocal coach ever (comparing to the two others I had).

My big issue with singing is mucus in my throat. My new vocal coach gave helpful tips regarding how to reduce mucus, especially days before or during recording sessions:

  1. Avoid drinking coffee and eating dairy and spicy foods.
  2. Avoid clearing my throat or coughing. Drink water or swallow instead.
  3. Don't chug water. Sip it and gulp it down.

My big problem is clearing my throat and coughing to get the mucus out. I avoid doing it during vocal sessions, but it's such a bad habit that I want to train myself not to do it often.

Can anyone provide guidance on how to deal with mucus?