1) First task was to find from 40 glasses filled with water from glass bottles, to find one glass with water from PET bottle. 2) Second Challenge was to arrange glasses according to mineral amount in water in ascending order. Dan Volevah is a professional Water Sommelier form Latvia. Launched a mobile water choice app PickAqua (Download on Google Play & App Store) Dan teaches online “The Art of Water Choice” at www.waterambassador.org