Not Medical Advice:
One of the best water pills that one could find in any drug store, with no prescription necessary, is simply a cranberry capsule or tablet. Cranberry acts as a natural diuretic and it also helps maintain urinary tract health.
Sometimes called water pills, diuretics help remove water, sodium and chloride from the body, as well as reduce the swelling and excess fluid related to water retention. Most over-the-counter diuretics contain the ingredient caffeine, which has not been proven to decrease fluid retention safely. If you are looking for an OTC water pill that will have a mild effect on your body, try to find one that contains a low concentration of caffeine in order to avoid most nasty side effects.