Fasting

Wait, what? Fasting? Why would you need to buy any supplies when you're fasting? 

Two reasons. One, there are a number of things, like green tea and apple cider vinegar, that you are allowed to consume when fasting. Not only that, but they have  been shown to actually make it easier to fast. And two. There are different types of fast that do allow things like MCT oil and bone broth.