Staying hydrated is crucial during the summer months, especially for office-going individuals. Dr Suranjit Chatterjee recommends drinking 2.5 to 3.5L of water daily, along with other hydrating drinks like coconut water, buttermilk, and herbal teas. Signs of dehydration include dry mouth, fatigue, and darker urine, but it can also lead to more serious conditions like heatstroke and kidney failure.