Final answer:
Chris McCandless slept in an abandoned bus, known as the Magic Bus, during his 113 days in the Alaskan wilderness, as described in Jon Krakauer's 'Into the Wild'.
Step-by-step explanation:
In Jon Krakauer's Into the Wild, Chris McCandless, the protagonist of the story, made his sleeping quarters in an old abandoned bus, which he referred to as the Magic Bus.
Throughout his adventure, McCandless sought a life of simplicity and self-sufficiency in the wilds of Alaska, away from society. He equipped the bus with a makeshift bed and lived there for 113 days, documenting his experiences and struggles in isolation until his unfortunate demise.