Different regions have different names for this delicacy. Pani Puri is easy to spot with its round shape. The snack is fried in oil and then mixed with vegetables. This mixture of vegetables includes chickpeas, purees, spiced water and other spicy ingredients. If travel with a tour guide, you will be able to know more about the delicacy.
Phan Pyut, on the other hand, is one of the worst food to try in an Indian street. In fact, Phan Put contains rotten potatoes, soaked in spices. It is quite cheap in price, though, not so in quality.
Indian food may not be appealing to most tourists given the spicy and hot flavors. Most foreigners will develop tummy aches, not really because of bad food. If you experience something similar, that is because you are yet to get used to spicy and hot food.