How to deduct my grocery purchased used in the catering business

Hi:

I am running a catering business from home where people order food and either get delivered or take out. Obviously, I have to buy the ingredients like vegetables, groceries, packing supplies for take out orders etc etc. How and where should I claim these expenses.  Appreciate a response and point me to which section of TT product do I enter in the Business section.

By the way, I am listing the Platform as "I Don't Know" not because I really don't know but because my Mac platform is not listed!!!