My husband is a singer and plays guitar. He will drink a cup of hot Green Tea with honey and lemon.....Works good in clearing your throat. It's also very good for you...Green Tea is full of antioxidents (a disease and cancer fighter), lemon has vitamin C, honey is also very healing in a number of ways...Did you know that Honey does not spoil?
Stay away from dairy products.
Before I go in for a cession I eat a banana.
The combination of ginger and honey is good for your voice, especially treating cough in an effective way.
Not sure about being good for the voice but it is very good for the stomach ailments.