Which drinks actually hydrate in extreme heat

Paris - 06.07.2026: During prolonged heat, regular drinking is the most important preventive measure against dehydration — ideally before thirst develops. French health authorities such as Santé publique France emphasize that the fluid and salt losses caused by sweating must be continuously compensated. Insufficient intake can lead to fatigue, dizziness, headaches and, in extreme cases, heatstroke with circulatory collapse.Water is recommended as the standard. Tap water in France is considered safe and is sufficient for everyday use. Those who find the taste monotonous can choose unsweetened herbal teas, diluted fruit ...