Okay, as per title, I found iPhone 6 on the street, the battery is almost flat and I don't have iPhone charger.
What to do now?
If by the time the battery flat, the owner is not ringing me, what can I do with this iPhone?
UPDATE: Okay, I managed to purchase iPhone charger from local shop (as suggested below), and the owner called this morning and I returned the iPhone. Thanks for the suggestions guys!
Buy a cheap charger online and see who's phone is it or hand it to the police.