Just go on a diet of minimal fruits, cliff builder bars (protein), protein shakes, and low sodium soup (half the calories are in the salt!) . Then get a good workout. I recommend exercise bike; it's the easiest.
I did it for two months on my own and the convenience store guy who used to see me stumbling in stupid drunk noticed I looked slimmer. So there you go.
Salt has zero calories. It does make you retain water, but not gain or lose fat.