Be prepared for rain, and both hot and cold weather. You just can't tell what you will get. It is not necessary to plan for or carry additional food. Do carry two filled quart size water bottles. If you want to refill water bottles at streams, you will need a filter or iodine tablets for purification.
All lodges have telephone or radiotelephone.
Most do not receive TV, or even AM or FM radio. Celphones may not work in the river canyon. Only Paradise Lodge has any available. Except at the lodges, evacuation or rescue is difficult and time consuming. Make sure your will is up to date before going on any wilderness excursion.