Question regarding supplies cost in different states

Hello! I'm currently researching how to file Schedule C for freelance costume-making commissions I've been doing and I've ran into a bit of a roadblock when counting for supplies. I am a resident of Indiana but I go to college in, and, as a result, dorm in Illinois; what exactly do I do about the fact that the sales tax of supplies I buy in person is Illinois sales tax and the sales tax of supplies I buy online and/or when home over breaks is in Indiana sales tax? I'm still learning how to do my taxes properly and I don't really know how to search for advice on this problem, because of how specific it is.

Thanks!