Lasix is some pretty potent stuff. And remember, you're not just losing water; you're losing other nutrients too, such as sodium. I would go for natural diuretics vs. medicinal diuretics. And remember that muscle is mostly water by weight, so if you lose too much water too fast, you'll deflate.
Tip: The more water you drink, the less water your body is apt to retain. If you're drinking minimal amounts of water, your body will hold on to as much as it can. If you're drinking a lot, they body doesn't need to retain as much; as if it knows it's regularly getting enough.
I'm an RN by the way, so I have to say this.
