You're going to have a few bad days. All of us will experience them with you. But you're going to be OK and you're starting again which is super. When I first did this I lost my weight but then started to eat and eat until I gain everything back minus 5#. That was just a waste. I was really upset with myself but you get it over somehow.
Take it from someone who has been in your situation and pass the 20 day mark this is going to take some hard work but it's worth it. Losing the #s is great but the attitude and self confidence sky rockets.
I hope you take this challenge and finish up your Water Fast with your goals achieved. Then I can say I knew you way back when. LOL
Have heart. You're going to be fine. And soon you will look FINE :)