How to prevent “Delhi Belly”?

Basically, you can't.
The world is full of GI diseases, even in developed, First World nations. There are some decent steps to trying to minimize your exposure:
  1. Properly cooked foods. Everything heated to a proper internal temperature (depends on the dish, check the USDA's site for guidelines), no sampling the raw chicken dish, etc.
  2. For fruits and veg, if you can't peel it, don't eat it. A tremendous number of GI outbreaks are due to fruit and veg, rather than meat. This includes things like salads - since you can't really peel lettuce, avoid it.
  3. Check if the local water is safe. When in doubt, assume it isn't. You can stick to bottled water, though there's always the distinct chance its being bottled from a contaminated source. Coke/Pepsi etc., and beer are good alternatives. Little known fact, the Coca-Cola company is hugely involved in clean water programs worldwide, because they need it for their product.
  4. Ice. Ice is bad. Its probably made using the local tap-water, and there are many beasties that can survive an encounter with an ice machine.
But when it comes down to it, nearly every traveller makes some sort of safe-eating "mistake" fairly frequently, whether they realize it or not. At the end of the day, your best bet is to talk to your travel physician, and see if you can get a prescription for an antibiotic. Using that in combination with something like Imodium will probably keep your trip mostly on track - shutting down the problem long enough for the antibiotics to treat the source. Unless of course its viral - norovirus, rotavirus etc. In that event, best of luck.
And if it does happen? Stay hydrated. You're losing salts and water, they need to be replaced.

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