How do you stay cool in a heatwave?

The best way to check your hydration level is to measure your urination color. Anything darker than straw colored is probably an indication that dehydration is on the horizon, and water is needed. Stay away from sugary drinks such as sodas(even if they are sugar-free!); they decrease the ability of your body to store water. Also, steer clear of alcoholic drinks, coffee, and caffeinated drinks, which are natural diuretics.