Good luck with this. Only advice for the Juice portion of your fasting is to drink only organic juices. Even 100% "all natural" juices have processed sugars, etc. And yes, I would do water as much as possible for your weight loss deadline.
GOOD LUCK. I'm on day 1 today and want to lose about 40 lbs. by mid-Feb. for a Costa Rica trip so I definitely can relate.