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by ginandtacoscom_Archive
Basically, avoid anything with sugar. Which in American beverages is usually corn syrup. But any sugars will have a generic sort of "coating" effect on your mouth, throat, and vocal cords.
So soda pop, beer, whiskey, coffee (aside from black) and fruit juices are all a bad idea. I mean, if it makes you feel like you're performing better, then drink it. But in terms of what's actually keeping your vocal cords free to vibrate, you want to stick to water and tea.
Most of all, though, it's important to just stay hydrated. I mean, milk or Pepsi aren't good for your singing voice but if it's a choice between that or nothing, drink it. If you get dehydrated you'll start to feel and sound shitty in a hurry.