carbonated beverages?
I'm not sure when I first tried it, I thinkit was arund 3 months out, but even now (at 6 and a half months out) when I just take a little sip, it hurts like crap and I have to burp immediatly. I don't even bother with it anymore unless there's no Crystal Light in the house and then I might end up shaking one up to where it's completely flat and drinking it.