Hillbilly Baked Beans

1/lb pound ground beef
1/2 C chopped onion
1 1/2 C barbecue sauce
1/3 C packed light brown sugar
1/2 C water
1-15 oz can kidney beans, drained
1-15 1/2-oz can butter beans, drained
1-16 oz can pork and beans, not drained
1/2 C crumbled cooked bacon

In a five-quart slow cooker, combine meat, onion, barbecue sauce, brown sugar, and water; mix well. Stir in remaining ingredients and cover. Cook on HIGH for four hours or on LOW for six hours. Serve immediately.