Andhra Pradesh Chief Minister Chandrababu Naidu said that Himayat Sagar, the second major source of water supply to Hyderabad will be completely dry by June 10 and water supply will have to be curtailed to once in three days. Another reservoir Osman Sagar had dried up at the onset of summer itself.Mr Naidu, at a review meeting with the officials said that twin cities of Hyderabad and Secunderabad need 165 million gallon of water but the supply was only 87 million gallon.