May 18, 2016 - 8:49 AM
Welcome to MySwissAlps EvieG!
I don't know the options for Germany but I would be surprised if you can't just buy a ticket on the spot, if there's a bus. The hotel might know that. If the hotel is actually just across the Rhine you can also walk across the bridge from the rail station of Bad Zurzach. That should not take more than 15 minutes or so.
The Swiss Travel Pass includes trains from Bad Zurzach. You can print the pass at home. Please see here for all options.