Nothing brings back childhood memories faster than seeing a kid run by with a bright red Kool-Aid mustache. That cold, refreshing sweetness, served up by the half gallon in the kitchen refrigerator. After hours of bike riding and running in breathless circles, a quick shuffle across the linoleum floor to reach for the big pitcher of brightly colored tropical punch is all we needed to refuel for another couple of hours. Becoming a grown-up creates an endless list of new options in life, but it usually closes the door to the simple pleasure of guzzling sugary drink mixes. Until now. Here it is: Adult Kewl-Aid.