AN A300 FLC TAKES THEIR RETURN FLT BACK TO JFK FROM MTPP; FO; AFTER EXPERIENCING A DELAY THAT PLACED THEM OVER THEIR SCHEDULED DUTY TIME.

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ACFT SWAP AT MTPP CAUSED EXTENSIVE DELAY TO OUR DEP. MAINT WAS ENRTE FROM MIA. SOC MADE SWAP DECISION. I WAS ADVISED OF NO POTABLE OR LAVATORY WATER ON ACFT. PAX WERE BOARDED. EFFORTS WERE MADE TO RESOLVE PROB; HOWEVER; PAX WERE UNRULY. USUAL MEANS TO CALM PAX FAILED. RESORTED TO USE OF MEGAPHONE TO RESTORE ORDER IN CABIN. WORKING WITH STATION MGR TO OBTAIN WATER FOR ACFT. DURING THAT TIME; A FEW FLT ATTENDANTS DECIDED TO LEAVE ACFT. I ASKED THESE FLT ATTENDANTS IF THEY WOULD LIKE TO RETURN TO ACFT. THEY REFUSED TO RETURN. WE DECIDED TO GO WITH 6 FLT ATTENDANTS. WATER WAS EVENTUALLY DELIVERED TO THE ACFT. ANOTHER FLT ATTENDANT DEPLANED TO RETRIEVE FELLOW FLT ATTENDANTS. ALL FLT ATTENDANTS RETURNED TO THE ACFT AND WE DEPARTED. ONCE UNDERWAY; ALL PAX PROBS CEASED -- PAX SLEPT. IN THE INTEREST OF SAFETY AND OPERATIONAL CONSIDERATIONS; IT WAS IMPORTANT TO DEPART MTPP AND RETURN TO JFK. IT WAS NEVER INTENDED TO EXCEED DUTY TIME. THE PURPOSE WAS TO DEPART; AVOIDING A POSSIBLY MORE SEVERE AND UNSAFE SIT. FLT WAS UNEVENTFUL. SUPPLEMENTAL INFO FROM ACN 448159: AT JFK; FLT FLEW UNEVENTFULLY TO MTPP. IN MTPP; DISPATCH GAVE OUR ACFT TO ANOTHER CREW AND GAVE US A BROKEN ACFT. PARTS AND MAINT ARRIVED ON ANOTHER FLT AND THE ACFT WAS FIXED AFTER SCHEDULED DEP TIME. PAX WERE LOADED WHILE WAITING FOR FOOD; WATER; AND ICE. WHILE TRYING TO RESOLVE ALL PROBS; REGARD TO DUTY DAY WAS FORGOTTEN. WE ENDED UP ARRIVING AT JFK BEYOND 14 HRS.