The Bharatiya Janata Party (BJP) on Sunday targetted Delhi Chief Minister Arvind Kejriwal over a study holding that supplied water is not good for drinking as it failed to meet the quality parameters.Delhi BJP chief Manoj Tiwari said that all samples of supply water of the national capital failed to clear the test conducted by Bureau of Indian Standards (BIS). According to a report done by BIS, Delhi's water is the worst among 21 big cities.