When I was there (10/29/06-11/05/06) we purchased food items for breakfast (bacon, sausage, eggs, & pancake mix. I cooked breakfast all but one day and we used CS for lunch and did TS for dinners. We still had some breakfast items left at the end (pancake mix mostly). We also had a few leftovers from our TS meals on our final day. We also ended up with 10 CS & 18 snacks left our final morning. We used the 10 CS without issue our final day (breakfast & lunch). While waiting for our bus to the airport we stopped at the hotel general store (Conch Flats) and used up our remaining snacks (11 of them, got popcorns at DTD earlier) by picking up chips, soda, candy, etc.
You can use snacks for anything $4 an under (at least at Conch Flats). They have those boxes of doughnuts for under $4 so you could use 1 snack to get those for breakfast (that is probably what I will do next year), use a CS for lunch, and then a TS for dinner. The DDP does give you a lot of food.