10 EFFECTIVE ways to reduce body heat NATURALLY With further ADO LETS GET STRAIGHT INTO IT 1 probably the most obvious but it works. Drink small amounts of cool water frequently. Drinking water helps reduce high body temperature and replaces the liquid you lose by sweating. Drinking water every 15 minutes is more effective than drinking a large amount in one sitting. Drink cool water instead of very cold water. If it’s too cold, it can cause stomach cramps or headaches.