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I could still taste the difference after decanting to a cup. I felt like it was still mostly can/bottle, but didn't have an American bottle to use as a control.

There definitely is a subtle difference. I was about to pick out the different drink reliably. It's just hard to imagine the difference is make-or-break between enjoying and intolerable for anyone. And it less likely comes from the sweetener and more from the Mexican water versus the water at your local Coca-Cola bottler.

West coast Coke vs East coast Coke would be an interesting test I've never thought about doing.