If you happen to find yourself in another country like India than do yourself a favor and only drink bottled water, and eat only foods that are cooked. International travel can be hard on the human body not only from the long flight but also from potential food aversion. Always check with the US international website for any questions on vaccines, emergency information, and other important information for your travels.
When I travel to other countries I always make sure I am current on all my vaccines such as hepatitis A and B. I find that I rarely fall sick, although its better to be safe than sorry. Cheers!