I confess I never take samples from the supermarket.  I just can’t bring myself to shuffle over to that sad little table manned by a person in a hairnet.  Perhaps if I did partake of supermarket samples, I would have known about ZIPFIZZ already.  I’ve tinkered with Emergen-C on and off.  Whether it’s the placebo effect or actually effective, I do believe it has helped me survive periods of compromised immunity.  That said, the taste and intensity leave something to be desired – even when I double up and use two packets.  During my recent training, I buddied up with an adorable flight attendant called Dottie.  She passed me a few tubes of ZIPFIZZ during a particularly draggy afternoon.  Skeptical, I added the powder to my water.  Cue the fizzy foam. Tasty and potent, ZIPFIZZ delivers a palpable boost.  Some swear ZIPFIZZ is the ultimate hangover remedy.  Peruse the nutritional information…