1) Exercise Regularly: it really is the best way to reduce water in the short term, as water shifts into muscles during exercise. You must still drink plenty of water during training though.
2) Sleep More: Adequate sleep may help your body control hydration levels and minimise water retention. 7 -9hours a night is considered healthy.
3) Stress Less: Long term stress can cause increased cortisol, which directly influences fluid retention and water weight. If you control your stress levels you will maintain a normal level of ADH and cortisol, which is important for fluid balance.
4) Take Electrolytes: Electrolytes are minerals with an electric charge, such as magnesium and potassium. They play an important role in regulating water balance. Warning though: if you take large amounts of electrolytes from supplements coupled with a low water intake, it can have the opposite effect and increase water weight.
5) Salt Intake: Sodium, which you obtain from salt, is the most common electrolyte in the human body. A high salt intake may increase water retention. It does depend on the individual's current sodium intake and blood levels though so manage your intake carefully.
6) Magnesium Supplements: Magnesium is another key electrolyte and mineral and has become a very popular supplement for health and sports performance. Studies show that magnesium can reduce water weight and premenstrual symptoms.