I just finished a 21 day Master-Cleanse on November 12. You should wait until you have a solid bowel movement before doing your liver cleanse. I started my liver cleanse on November 23. I take Dr. Shultze's formula 1 and formula 2 for a colon cleanse. You can eat whatever on his colon cleanse. I started the Colon Cleanse on November 27. Although, my husband has taken the oxy and you do need to be close to a bathroom.
As far as diet, take it slow getting back into food. Listen to your body. I consumed OJ then soups, yogurt. I eat what you would probably consider a high fat diet, meat, vegs, fruits, oils, no grains (sometimes homemade rice bread.)
Glad to see you made the 21 days. I also enjoyed your postings.