I would use a thiazide diuretic before using a loop diuretic (like lasix). Much safer. If you do use lasix, you MUST supplement with potassium chloride tabs or you risk radical electrolyte imbalances (hypokalemia is a real risk).
Something like hydrochlorothiazide is often prescribed to PMS'ing women as a water pill. It works because I've taken my wife's tabs before, but you will feel pretty crappy on 'em because they flush out your electrolytes (NA, K, CA, etc.) with the excess fluid.