Can you spend the day hydrating with 2/3 litres of water and then stop drinking at say 4-5 pm ? That way any water that's considered 'in excess' by the body should have flushed through by the evening show, but with a sufficient stored reservoir in the body tissues to keep the larynx moist through the show. And, I guess, make sure that the loo is stacked with good reading material!
Kevin.
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