You should certainly check some if not all the other endings, they provide more context and are a lot more interesting. If you want I could assist you with all the choises or when to save the game so you can check all of them in less than an hour. If you want to just achieve the "true" endings by yourself Ill give you some clues briefly. In the begining you asked the stranger for 1 favour, the water, and you returned it by leading him to the city. If you ask him for a second favour you'll have to return it too, Quid pro quo. Dont accept water from him for the second time or food and