I'm on day 6 of my water fast. Please allow yourself a lot of rest while you are on the fast. Believe me. I needed it. I was dizzy, weak, and had terrible headaches the first 2 days. I could barely concentration. But by the third day, since I'm learning Japanese, I review my Japanese grammar, watch Japanese drama online, and practice writing Japanese. I also paint and do calligraphy. I read books that I've accumulated. I take short walk around the neighborhood, not too far, in case I get dizzy. That's only after the first two days. I love having this time to rest and recover.