Generally speaking, not catering meals on the Caribbean turns is a blatant violation of the JCBA. From PHL, most (if not all) of the turns should be catered in both directions, but they almost never do. CLT is likely the same, as the flights aren't that much shorter. If they don't provide a crewmeal, refer to the flow chart to determine if they should have - make sure you adjust the bloc times correctly, and use the adjusted times to determine whether you have sufficient ground time between flights - and if they don't provide a meal they should have, get something nice and expense it.