Mix Together The Barbecue Sauce, Ketchup, Onion, Celery, Water, Garlic, Honey, Brown Sugar, Worcestershire Sauce, Chili Powder, Hot Pepper Sauce, Salt, And Black Pepper In A Slow Cooker Until Thoroughly Combined. Place The Pork Roast Into The Mixture, Spoon Sauce Over The Meat, And Set The Cooker To Low. Cook 7 To 8 Hours; To Serve, Shred The Meat With 2 Forks, And Serve With Sauce.