Unmentioned so far, but useful, and easily hidden... cough drops. Halls in particular are my preferences, the Vitamin C ones with no menthol. They also don't excite the bladder as much as you might with other solutions. You can tuck it in a cheek or under the tongue and use it sparingly.
A lifesaver when, during my incredibly short college acting career, we were doing a lot of work in the round.
Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.
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