Neither of my kids ever ate three meals in the dining hall…ever. We parents ate one meal with our kids in the dining hall…one…and that is over eight years of college.
And yes, our kids both ate three meals a day here at home.
Both had a hearty supply of packaged snacks in their dorm rooms…we stocked them up on applesauce, granola bars, etc. both had fridges as well, and both would get yogurt, for example, for a quick breakfast,when they were in a rush (which was just about every day…).
If your kid has 14 meals a week, plus some flex points, he will probably be fine.
Again…I would not purchase a meal plan with the intention of feeding your family when they visit. The meal plan should be for meals for your college kid…not you. If you want to eat with him at school, take him out, or bring a picnic lunch.