I would look into other cities with viable transit options, as others have suggested. Texas is so individualistic than I doubt any bus tours will be offered. It will be assumed that anyone who cares enough to get to the path of totality will do so on their own.

The University of Texas *might* offer some sort of programming, but it would be out of Austin. Their astronomy presence is mainly at Fort Davis observatory, which is 8 hours away in West Texas, and not in the path of totality.