Edema occurs due to the accumulation of fluids, so it might sound a bit weird to drink more water to prevent edema. But the person should drink plenty of water and stay hydrated to prevent edema because water helps flush out the waste products from the body. If the person does not drink a sufficient amount of water daily, the fluids remain in the body. During summers, the person needs to drink more water than required to prevent dehydration and heat edema.