What do I need to use my Rebel Digital Camera Charger in India?

You need a 2.54 volt converter.

I am not sure how a Rebel charger looks like, but I am guessing it would similar to any other Canon product. If that is the case then you just a pin that is just in India . You can find it in any local electric shop. They sell for Rs 10 to Rs 50 depending on where you buy it from. Just connect your charger to that pin and charge it. I have a canon digital 6 mp camera and i just am back from India and used that pin. I am not sure what that pin is called, coz my dad had got it for me. But it is a very small thing and has round pins instead of flat. Just take your camera to the shop and ask them for the pin they will be able to give it . Do not leave the camera with them. Also most of these chargers come with converters within so which is why a pin is enough read what is written on your charger. They would have wriiten 120-240v . Mostly all Canons have converters. I have three Canon products all having converters built within.

Good Luck