Mumbai With the city reeling under the threat of an acute water shortage in the coming months, the Brihanmumbai Municipal Corporation (BMC) is appealing Mumbaikers to bank on the ancient technique of rainwater harvesting. Even at the Jal Mela, which it has organised to sensitise the city to consume water in the most intelligent way, the civic body is thrusting mainly on rainwater harvesting and better water management. Moreover, in order to attract the attention of the Generation-Y, the civic body is using innovative methods like quirky posters, radio jingles and has also tied up with popular eateries like Caf