Rinse pork with water and pat dry with paper towels. Rub salt and pepper all over the pork and put in crock pot. Add the water and liquid smoke. Cook on low 8-10 hours, until pork is very tender. Remove pork from crock pot and discard remaining liquid. Shred pork and put back in crock pot, along with the barbecue sauce and allow to reheat for another 20-30 minutes. Serves 10-12 adults.