Hello Hirama666
Some schools use a card for Food Service. Those cards have a barcode on it.
Students cannot make food reservation as I know of. The Serve Meals program only allows for the same day.
You have to think of this module as a helper for the food service staff who directly register items as they serve the food.
You may have more luck using the attendance system. You can create a "Lunch" attendance codes category:
Then associate it to a course period, so a teacher can take which food option the students will have.
Attendance can be taken for one week or even a month in advance when well configured.