Water IS a very effective diuretic. Water IN equals water OUT. Your body is going to maintain homeostasis as long as it's healthy. Tea is another diuretic thanks to caffeine. THEREFORE, other diuretics include coffee, coke, mountain dew...anything with caffeine. As a paramedic, I have access to an EXTREMELY potent diuretic called Furosemide (trade name Lasix) that we can give for a CHF exacerbation. You nwill pee...and you will pee A LOT. That said...it's very dangerous, as is experimenting with a lot of medications. Herbal meds...eh...slightly less dangerous but you still have to be careful. Diurese yourself too much/too fast and you get an ambulance ride with me and a lot of fluid pushed into your veins.