A can of pop (12 oz) is 1 serving, while the 20 bottle, like WI said is 2.5 servings with 1 serving equal to 8 oz. WTF?!

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Clever? Nah, I ran out of that years ago. But if you find this, let me know, k?
"The road goes ever on..." ~ Tolkien

In memory of my friend skip...
Go then, there are other worlds than these