Please advise where NItro Fuel for COX .049 Glow Engine will be available, in India. I am from Kolkata and would prefer availability of the same in my city. Someone please suggest. Small quantities would do.

You might want to search the forums for an answer. Mix your own if not available in your city. The raw materials are generally easy to get

http://www.rcindia.org/rc-outlets-and-resellers/imported-nitro-fuel-now-in-india/
Check this out.

Purchase from hobbysea.com
It will reach to your home by courier. No issue...
and vineet, the shop owner, is a nice person.