Into your slow cooker add the bacon, onion, garlic, beans, vinegar, bbq sauce, brown sugar, mustard, Worcestershire sauce, chili powder, black pepper, salt and Dr. Pepper.
8 slices bacon, 1/2 small onion, 2 cloves garlic, 30 ounces pinto beans, rinsed and drained, 30 ounces red kidney beans, rinsed and drained, 30 ounces white cannellini beans, rinsed and drained, ½ cup vinegar, ½ cup bbq sauce, ¼ cup brown sugar, 2 Tablespoons mustard, 1 Tablespoon worcestershire sauce, 1 Tablespoon chili powder, 1 teaspoon black pepper, 1 teaspoon salt, 7.5 ounces Dr. Pepper soda