Rishu... Yesterday during our ride, I think I saw the camelback being sold at the Wildcraft that is at the intersection between Linking Rd., Turner Rd. and SV Road near Bandra Station.
The one I have, according to the box, was bought from "Smart Designs", 208, Hanuman Industrial Estate, G.D. Ambekar Marg, Wadala. 2412 2030, 6663 5228, 98696 47628, email@example.com, http://smart-designs.tripod.com (though the site seems to be empty)