sentences:  After the 2004 Asian tsunami and Hurricane Katrina disaster in the U.S., Michael Pritchard, a water-treatment expert in Ipswich, England began to develop the LifeSaver bottle after hearing the idea from Zackary Kepes and Austin Castellano.Pritchard presented a prototype of the LifeSaver at 2007's DSEi London, where the product was named "Best Technological Development".Pritchard's entire stock of 1,000 bottles sold out within four hours of the presentation.