You could do several different combinations of meals;
3 CS a day, (not worth the cost though.)
3 1-TS meals a day
1 1-TS & 1 2-TS meals a day
or some combination of CS and TS totaling to 3 credits.
Of course, you could always do three two-TS meals in one day, even if your only going for two nights, and then just live on the snack credits the next day, but I wouldn't recommend that.
On my first full day with the deluxe plan I am planning on using five credits, (two for breakfast at CRT, one for lunch, and two for a signature dinner,) there are other days however when I'm only using two credits. It all works out in the end though with my plan.