Eat hot, cooked food, and keep water sealed

Most stomach trouble comes from water and raw food, not from street food as such. Drink sealed bottled or filtered water, skip ice outside good hotels, and avoid raw salads and cut fruit from stalls. Freshly fried or grilled street food from a busy stall is usually fine; samosas, dosas, and chai are safe bets. Carry oral rehydration salts and a basic anti-diarrheal, and give yourself a gentle first few days.