Many hotels offer a free or very cheap breakfast. Stoke up and you can get by on much less the rest of the day. Sometimes you can discretely make some sandwiches or wraps of breakfast foods and stash it for lunch. Get some fresh whole fruit, too.

Street food is too often passed over by timid tourists. If it is prepared fresh and served hot there is little chance that it will make you sick.

If you want a bit of added safety you can chew a couple Pepto-Bismol tablets before. The medicine in them has a mild antibiotic effect and many people swear they can eat anything and not get sick.

Potable water can be an issue in many places. Bring along a Steri-Pen and you can drink any clear water on the planet safely. It is very quick and after a few weeks it will pay for itself in savings on bottled water.