Day 2 questions

Ok. so my post isn't showing up so my apologies if this is duplicated.
I'm on Day 2 and I'm doing surprisingly well. I have some hunger and some lightheadedness. Last night was awful. But this morning I had energy to burn so I'll pray for more times like that. I don't think I posted my complete plan in my first post. I am planning to go for 66 days. Same number as books in the bible. I'm not planning to go the whole 66 days on water but I want to go as long as I can on water but I don't know how long would be healthy. I've read that my body will tell me when I need to switch to juice. But I don't want to confuse that with my body telling me it's cleansing. How do I know the difference? Are there different symptoms? I'd appreciate anyones answers if they have them.