Delhi BJP chief Manoj Tiwari challenged Chief Minister Arvind Kejriwal to drink water from the polluted Yamuna river, after seeing the condition of river during a cleanliness drive in Delhi's Sonia Vihar. He also assured that water level in Yamuna would increase on the day of Chhath Puja as he had asked for water from Haryana CM Manohar Lal Khattar.