This is entirely up to you. As a perk of being your own boss, you can choose how your fees work. If a client doesn't already have the necessities to ensure their success (i.e, storage boxes or mason jars), you can choose to provide materials for free, or charge their exact cost in addition to your per-hour or per-project rate. We always recommend being upfront about the cost. Working with your client and receiving their input and approval before making purchases will guarantee a solid working relationship.