FREE Mio Water Enhancer at 7-Eleven Today Only! I may have been given a product or money for this post and/or it may have affiliate links in it. Disclosure PolicyApr/23rd/2013 by Crystal Leave a Comment Today, April 23rd, you could score a FREE Mio Water Enhancer at 7-Eleven! Just check the 7-Eleven page to see if your location is participating. While supplies last. Valid today only.