In hot and humid climates, it is wise to increase your water intake. If the intake of water is less than needed, the body can get prone to dehydration which can prove fatal. Well, it's not impossible. Water acts as a natural appetite suppressant, thus helping you to loose weight and keep it off. Research has proved that increasing the volume of fluid in your body can lead to an increase in fat breakdown.
Water actually helps in the metabolization of fat.
To achieve fat loss via hydration, one should drink at least 8-10 glasses of water per day. This site is informative in nature. For any serious medical condition, always contact a qualified practitioner.