Water fasting to lose weight

I realize people don't think water fasting for a week for weight loss is smart, but I want to try it. Also, I am retaining 10 lbs of water weight (was 10 lbs less a week ago) and have gained in total (including water weight) 14 lbs in 5 weeks. My question is, how much weight can I expect to lose if I work out on top of it? I have done a 3-day water fast and did an hour of jogging on the treadmill everyday and felt fine.