Most of the equipment of the kit you receive will be reusable and this is the fantastic part about the whole thing. And yes, this does include both the bottles and the caps. However, it is a bit more complex than you may think. For starters, if you do want to reuse the bottles, they need to be thoroughly cleaned (not just a quick rinse job). Also, if they have internal scratches, you may want to avoid them as this can lead to bacteria. For the caps, clean them as well but you really want to ensure that the threads are not stripped.