Smoking is not permitted in the house. This is meant to be a period of calm and contemplation as well as de-tox and lifestyle change; therefore telephone calls are seen as an invasion of your peace and tranquillity. Unless it is really important you are asked to limit telephone calls.
A dressing gown or two and comfy footwear i.e. Dr. Scholls, as you will be in these for most of the time. Also, any books you have longed to read.