Sweet 'n' Smoky Crockpot BBQ Chicken

1 broiler-fryer chicken, cut in serving pieces
1/2 cup water
1 teaspoon hickory smoked salt
1 large onion
sliced 1/4 teaspoon pepper

Barbecue Sauce (combine following ingredients):

1/2 cup catsup
1/2 cup cooking oil
1/2 cup maple syrup
2 tablespoons prepared mustard
1/4 cup vinegar

Rub chicken with hickory salt then place in slow cooker. Place onions on top of chicken. Combine barbecue and pour over top of chicken. Cover and cook on low for 8 to 10 hours.