You may buy one of these in India. They can be cheap and are available in most shops. You may also buy an universal power strip which can handle most of your electronic gadgets; including phone, camera, laptop etc. This way you can charge many gadgets at a time.
Please note: most plug adaptors you buy in India are not voltage converters. If you have devices (electric shaver, hair dryer, etc.) that only operate on 110V, it is advised to buy a voltage converter. Some “international” hotels will have a 110V outlet in the bathroom.