I know that 20 oz seems low, but at the very begining of my fast I was drinking a lot more like 64 oz a day. My body now tells me how much I need and I drink according to that need.
I didn't have a lot of energy the first week, but now I have so much energy, that it is hard to contain at times.
Yeah, taking that birth control pill would cause your body to think it is going to get food because it is irrating the lining of your stomache and causing the acid to be activated as if you were going to eat. That might be causing some of your tummy rumbling.
I am on day 17 and I am doing fine and have alot of energy.