organic/free-range/natural milk,chicken (Calcutta)

Hi,
I have looked online but cannot find organic produce, milk and chickens, or at least milk and chickens raised without antibiotics and free-range. I have been in touch with Satavic Farms, and they are supplying some other organic foods, including eggs. They said that there is no reliable source of organic produce in the city, which is fine, because I can just wash the produce with vinegar and baking soda solution. But Where can I just buy even higher quality chickens and milk?
And can you recommend any good grocery stores?
Thanks,
Hilary, new to Kolkata this month