Pms induced water weight :(

Hey, this is my first post! Im in the National Guard, and as of right now I'm failing my height and weight requirements by only a couple of lbs, which has me barred from the promotion I was supposed to earn back in March . I work my *kitten* off at the gym and I've been eating a rather clean mostly vegetarian diet. My problem is, for the past few months, between drills I've been able to get down to the the weight window allowed for my height. But my lovely visitor comes right before drill and end up like a bloated dead seal (gaining up to seven lbs!) and fail height & weight. Of course a few days later, I'm fine again. I've got drill next weekend, and Im sooo close to making weight! (granted, I have a way to go to reach my overall goal). Any tips for getting rid of bloat and water weight? I need this promotion!!!!