Drinking is the best first aid when you’re sweltering in the heat. But did you know that you shouldn’t sip water indefinitely?
You need a couple of litres of fluid a day under normal conditions, but during a long heatwave you need at least twice that amount. So if you get a headache on a hot day, head for the nearest tap. Drink cool drinks at a steady rate throughout the day, 2-4 ounces per hour.
