Thanks for writing to us, and for your question about using our materials. We appreciate your thoughtfulness here.
The Community Tool Box does in fact have a Use Policy, at https://ctb.ku.edu/en/use-policy. It’s on a menu tab at the bottom of our home page, though granted one might have to look a bit for it. But as we understand your intended use, it would fall under paragraph #2 in that policy, which means you would be free to use and copy materials for non-commercial use within your internal workgroup.
Please do credit us when you use our materials. In this case, something like “Adapted from the Community Tool Box, https://ctb.ku.edu, by permission” should be fine.
We hope this is helpful to you. Thanks again for being in touch, and all best wishes for continued success in your important work.