Mix all spices in a bowl (brown sugar, cayenne pepper, paprika, salt, pepper, chili powder, and garlic powder).
Rub spice mix over the pork covering each side.
Add apple cider vinegar and coconut water to a slow cooker. (You can also add an additional 1/4 cup of water if liquid is too shallow in cooker.)
Place pork in the slow cooker.
Cook on low for 8 hours.
Shred pork and use in your favorite dish!