Don...I would suggest gargling with some warm water.
You may want to try and drink a little tepid water with some honey in it also.
At least this has worked for me when I've done a theatre run of 10 to 12 shows.
Nothing ice cold, as much as you might want to, it'll only tighten up your vocal chords and constrict everything, so again...nothing too cold.
Good luck, and Good Show!!

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...shboom

[This message has been edited by shboom (edited 05-13-2005).]