We did this exact thing last time we went and had like 12 leftover credits at the end of the trip. We were driving so we were going to DTD on the way out of town, so we went to Earl of Sandwich and order 12 sandwiches to take on the trip home. We chose things that would be good later cold like PB&J and Ham and Swiss. The CM's there were very helpful, suggesting good sandwiches and allowing us to substitute bottles of drinks for like two credits. Normally you can only get fountain drinks with the CS credits, but we were able to get 6 bottles of water or lemonade etc. instead so we could take it with us. This helped us a lot on the way home because we didn't have to stop and pay for dinner. We stopped at one of the rest areas and ate at a picnic table, plus had leftovers for a snack later. worked out great for us.
If you aren't driving or can't get to DTD, you could probably do something similar at your resort CS restaurant.