Question: what are the main sources of drinking water for tuscaloosa
[{'answer': 'Black Warrior River', 'provenance': [{'wikipedia_id': '105167', 'title': 'Tuscaloosa, Alabama', 'start_paragraph_id': 1, 'start_character': 138, 'end_paragraph_id': 1, 'end_character': 157, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '105167', 'title': 'Tuscaloosa, Alabama', 'start_paragraph_id': 177, 'start_character': 0, 'end_paragraph_id': 177, 'end_character': 657, 'bleu_score': 0.547536712373159, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2879812047430715699}, 'section': 'Section::::Infrastructure.:Port of Tuscaloosa.\n'}]}]