Crystal Light contains aspartame. Some of us are allergic to that stuff. Anyway, it's still a soft drink. Carbination is not required for a "soft drink". All "soft drink" means is that it's not alcoholic, as far as I know.
You can get non-caffinated, non-sweetened drinks. I've found flavored seltzers in the supermarket, for instance. Note that the flavor is more subtle than the normal overpowering cola or whatever flavor you're used to, though.
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