I lost just over 80 pounds from water fasting for 4 months.  I ate no food and had only water, diet soda, and Crystal Light.  I also did a diet of 240 calories a day for 1 month afterward, and lost another 20 pounds (lost about 5 pounds a week), so I lost about 10 pounds in 2 weeks eating 240 calories a day which is similar to your 200 calories a day.   
So, I guess you might lose about 10 pounds in 2 weeks on your diet.  Keep in mind you will also lose some water weight when you first start dieting.  Your body won't hold as much water when you eat less.  You'll be eating less sodium and other things that make you retain water. So you may lose closer 15 pounds, but keep in mind a few pounds will be water.   
Don't listen to people who say you will die.  You will not.  I guess they've never been sick before and went a couple weeks without eating, which is weird.  The body can go a very long time without food.  I have done a few long term fasts - the longest being 4 months.  That was about 6 years ago, and no weight was regained.  When you eat less than you need, your body uses its own fat reserves for energy.  It will do this until there is no fat left, but you will be really lean way before that happens.

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