I run a B&B out of my house. How do I deduct for depreciation of the portion of my home that is dedicated to the B&B. How can I deduct for cost of food and other supplies

I am using Turbo Tax Home & Business. I have a home office that I run one business (IT consulting) out of.  The B&B is a separate business and guests use 1 bedroom and an adjoining bathroom exclusively. They also have unrestricted access to the Living room, dining room and kitchen, should they wish.