Crock Pot Potato Soup

8 large potatoes, cubed
1 medium onion, chopped
3 T. butter or margarine
1 lb. bacon, cooked and crumbled
3 chicken bouillon cubes
2 T. dried parsley
6 c. water
2 c. milk
1/2 c. flour
1/4 c. water
1 t. salt
1/2 t. pepper

Combine all ingredients except flour, 1/4 c. water, salt and pepper into the slow cooker.