How to get rid of water weight gain?

Depends on cause. Usually with sodium restriction and water pills . It's important to investigate why you have water retention and make sure it's not heart failure or some thing serious .
Low salt diet. Low salt diet, decreasing fluid intake. Need to find out the cause- kidney disease, heart disease, liver disease, low albumin.

Related Questions

How can I get rid of stretch marks that have developed as a result of weight gain? Thank you.

Lotions & creams. Over the counter lotions and creams for pregnant moms to avoid 'stretch marks' can mask some of the elastic 'broken skin' marks. Read more...
Resurfacing . Consider skin resurfacing procedures , currently state of the art is with use of lasers. Discuss it with a trusted dermatologist in your area who performs these procedures, good luck. Read more...

I ate really badly yesterday. Cantaking diurecic today help flush the water weight gain out?

Not a good idea. Flushing out the water weight , ie urinating, with a diuretic is not a good idea. The water will be quickly replaced in short time, if your body is functioning properly. In addition, essential electrolytes will be compromised which can protentially create problems. "water" in the body is both intracellular and extracellular and equilibrium will be maintained. It's a trick used by charlatans. Read more...