The accommodations for a typical trekking trip in Peru will be camping. Typically, you will have to provide the sleeping bag and pad yourself while the trek operator will provide the tents, cooking equipment, food, and water purifiers.  For specific trip deatils, you should refer to the "What's Included" section of a particular trip.  With a high quality company, you will usually get higher quality gear.

 Some treks use hotels in villages or towns along the way.  Again, please refer to the specific trip to find out more details about the lodging options available.