Go to Podestien, lovely old town, lovely old town.
cards, yup been caught out myself, take Euros with you, much better, resaurants in the outer lying areas in Bavaria are still really rural with a local community spirit, restaurants I’ve been to open when they want to rather than stick to some timetable. Most I know open on Sunday eves, though this area is heavily family orientated so expect a few closed doors whilst they spend time with their own families.
Bakers open in the morning mind, so you can get bread easy enough, some “super”markets open about 11ish, local markets are open and tend to be in the center of towns and of course you’ll find something to eat there, certainly if you are a meat eater.
You could try the service stations on the motorways, not that expensive all things considered, but do what I do, take Euros and stop off in the first local twon you spot, head for the center and go seek out the market.
Bavaria…. stunning place.