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I haven't tried them, but I buy them for my son. He says the water fountians at school taste old, whatever that means. So when he refills his water bottle at school he adds it then. He likes them. He asks for the fruit punch flavor.
What he probably means is that the water tastes like what you'd get if you let a cup of water just sit around for a few weeks out on a shelf, sort of like a "stale" taste.
Our water fountains back in my high school were like that too.