Rub pork with spice mixture. (I was lucky to find a spice mix called Harvest Maple at Harris Teeter. I've listed the spices included above in the recipe but you could also just use salt and pepper.)
Put seasoned pork into the slow cooker and add ½ cup water.
Turn on low and cook for 6-8 hours.
Right before it's done add the vinegar, water and brown sugar to a small saucepan and bring to a boil. Turn down to low and simmer until it thickens about 5 minutes.
Turn broiler on low. Place rack in top third of the oven.
Remove pork from slow cooker, place on a foil lined cookie sheet and gently shred with a fork into big pieces. Brush pieces with some of the balsamic glaze.
Place under the low broiler and watch carefully. Broil it until it starts to brown to your liking. I left mine in for about 8 minutes but this will depend on your oven. Remove at least once to baste with more of the glaze.
Serve with any remaining glaze on the side.