There shouldn't be too many exceptions, however. But here are some things I will allow myself to purchase:
Toiletries (toilet paper, tampons, soap, etc.)
Necessary household items (i.e. nails, tape, if some kitchen thing breaks I can replace it)
Shampoo/conditioner (as it runs out)
Skin cream (only if I run out of all possible options that I already own)
Craft supplies (i.e. yarn)
I also want to create a monthly budget, and be accountable to see how my spending matches up with what had been projected.
I also need to think about food-related items. If I forget to pack a lunch, I won't starve myself - I will buy a lunch. But within reason. And I should pack lunches and prepare meals ahead of time as much as possible.
So much to think about! But I have 21 days to solidify the guidelines.