Such detailed information is provided in the tour documents, which you will receive upon arrival to your first hotel.
The documents generally indicate where there is a town (or towns) along the route in which you can find a place to eat lunch. Some tour documents will even suggest specific restaurants. Alternatively, you can stop at a local grocer and pick up some goodies for a picnic lunch.
For dinner, you can expect to be in an accommodation/location with at least one option, if not many. We suggest asking the hotel staff for a recommendation on where to find delicious local fare!