I have received timely my blu Chilly's Bottles safely wrapped and immediately started using it also given the high temperature we are having in Italy. What I do I add some lemon juice and fill it once the tap water is get cool. In this way I have fresh water all day long . I even used it when going to the sea side and kept the backpad behind a rock so not to be in the direct sun light. I highly recommend this bottle which save you to buy bottles of mineral water when going around the city and fill it up with fresh water when you see litle fountains with spring water.