Heading to the pub to watch England for the hottest June day on record? A professor tells Harry Bullmore what to order at the bar to avoid dehydration while still enjoying yourself, and what to know about the ‘eight glasses’ of water a day myth A s an expert in sports nutrition and part of the team behind the 2008 studies that led to hydration breaks at this year’s World Cup , Professor Ron Maughan is something of an authority on the topic of dehydration . With amber and red weather warnings in