Just go to any shop who is dealing in/making/selling stabilizers, UPS etc and ask them to make you a 110v ADOPTER.
Tell them required wattage (100/200/300/500 Watts) and they would make you one in day or two.
Pay heed top these things/specs:
1. If the device you want to run require 100 Watts, make yourself a 200 Watts Adopter. I mean always double the wattage.
2. Ask them to use copper wire of a higher gauge.
This converter is popularly called '110v Adopter'. Its available everywhere and anyone who has a basic knowledge and tools can make one. If there is a 'bijli wala' or 'electrician' in your 'gali-mohallah' who has a shop and repair irons, stabilizers, UPS and other electrical appliances, he can make you one. There are some read-made available in the market that cost 200 to 400 Rs but do not buy them. Order one for yourself and a good one would cost you around 500 to 1100 Rs.