HEAD Sauns advice!!!
I lived and worked in India for 2 years and travel internatioally on a weekly basis for work. Your body won't get used to the new conditions during such a short trip so always be cautious. Drink UNOPENED bottled water. NO ice in your drinks and go to the busy/ popular restaurants as you will give your stomach a better chance of survival. Would suggest you take some Imodium tablets just in case your stomach is a little delicate.
Hope I am not talking out of turn but want you to enjoy your trip as much as possible.