Water from the river Ganga is considered holy by Hindus, the closer to the source of the river, the purer. So ever since Sunday, when post offices started selling "Gangajal" across the country, the bottles are flying off the shelves. For the devout, a boon. But some are asking how can government sell national property? Kolkata's historic GPO or General Post Office, which sold mostly stamps since 1865, has suddenly discovered a new hot cake: bottles of water from Rishikesh, 300 km from the river head Gangotri.