Luckily, water is a great natural appetite suppressant. There are three ways we get water into our bodies. We get it from the foods we eat, the fluids we drink, and as a by-product of metabolism. It is always better to drink pure water instead of soda, tea, or coffee. These products actually increase your need for fluids because most contain caffeine, which is a diuretic. Diuretics force out stored water along with certain essential nutrients.