As a vocalist or speaker, Heath is a vital thing as missing performances can be a huge disappointment and a loss of income.
I recommend the daily use of a good quality Manuka Honey that can be simply taken by the spoonful, spread on toast or made up as a hot drink with a wee bit of cinnamon is nice. If you begin to feel the beginning of a sore throat or cold symtoms then up the dosage e.g a teaspoon every 2 or 3 hours until the symptoms cease. And especially prior to bed time after brushing, be careful not to wash away the honey from the throat area and leave to do its good work over night. I personally have done this and experienced no sore throat at all by the morning. This is a great natural way of maintaining good heath.