Extra Fluids Direct
Hot or humid weather increases perspiration, while high altitudes and dry indoor heat can accelerate moisture loss through the skin.
Not all "extra fluids" have to be plain water. You can reach hydration goals through various sources: Diarrhoea Treatment Guidelines Extra Fluids
Doctors often advise extra fluids during respiratory infections like colds, flu, or bronchitis to replace losses from fever and to help thin mucus. Hot or humid weather increases perspiration, while high

