If you want to treat ascites with a natural remedy, altering your diet may be a good place to start. Certain vegetables, like radishes, are very good at regulating fluid balance in the body, and can help reduce the excess water in your abdomen. The natural fiber in radishes also helps optimize digestion and can eliminate inflammation, which is another cause of ascites. You can mix the juice extracted from the leaves of the radish plant with water and drink daily on an empty stomach.