They're the same thing. And you're right, the water would lose its fizz. Just a waste of money. What it IS good for is adding, very cold, to tempura batter. Makes it lighter.
And it's also not unheard of to use cola in cooking meat. And in barbecuing it. I think it's more likely to be done in the South. Nothing wrong with that. But... Pepsi for pasta water?
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