Mix Seasoning Mix, ketchup, brown sugar and vinegar in bowl until blended; set aside.
Heat oil in Instant Pot on SAUTÉ function. Place pork in pot. Cook 5 minutes or until lightly browned, turning once. Add water. Pour in sauce mixture. Close lid. Set Valve to Seal.
Set to cook for 60 minutes on MEAT/STEW function or until pork pulls apart easily. When done, quick release the pressure. Open the lid once pressure inside the pot is completely released. (Check manufacturer’s manual for safe operating instructions.)
Remove pork and place in bowl. Shred pork, using 2 forks. Return pork to Instant Pot. Mix with sauce before serving. Serve on sandwich or slider rolls, if desired.