Shredding poundage

Howdy! I am assigned to an office out of town for the next five weeks. I weigh 350 and I want to see how much I can drop..I am looking for opinions what do you think is the most effective diet I can follow for maximum lbs shreddage?

Straight fast? Coffee fast? Juice fast?low carb? I will be doing cardio at the beginning and end of my day.

Just looking for opinions. Don't care about safety or longevity, this is just an experiment for these five weeks before I go back to my normal routine.