Mix all spices together thoroughly.
Rub spice mixture on entire surface of the pork.
Place the pork, fat side up, in the Instant Pot and add water.
Secure the lid and set on manual for 70 - 90 minutes.
Let the Instant release pressure naturally for 20 minutes. Manually release any remaining pressure.
Remove pork to a platter to be shredded.
Turn the instant pot back on manual and let the liquid boil until it is reduced by half.
Return shredded pork to the Instant Pot and stir until well-coated.