Place half of the thinly sliced onions in bottom of slow cooker, add pork and water, along with remaining onion slices. Cover and cook on LOW for 8 to 10 hours or 4 to 5 hours on HIGH heat setting. Drain liquid from slow cooker, chop the meat coarsely and discard excess fat. Put the pork back in the slow cooker. Add barbecue sauce and chopped onion. Cover and cook on LOW for 4 to 6 hours longer. Stir occasionally. Serve with warm split buns and coleslaw.
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