Wanted to make sure using PB shakes accurately

I am doing The Master Cleanse and would like to incorporate PB shakes with it. However, I think I'm doing it wrong. This morning I made my lax tea, drank my shake, drank a glass of water, and then started on my lemonade. I read somewhere that it needs to be taken on an empty stomach. Does that mean from solid foods? Is it okay for me to drink water and my lemonade after drinking the PB shake? If anyone has done The Master Cleanse and PB shakes, could you let me know what your regimend was or is? I appreciate your help. Tweet