Water, water and more water!
I also kept a 'log' of my daily food intake to be sure I could keep my weight up--am very thin to start with, and had lost 7lbs before treatment because of jaw tumour restricting mouth opening.
I wrote 'round robin' emails to friends to keep them up to date and keep the phone 'at bay'--an ansaphone is also a good idea--caregivers can then update people as and when they wish, yet people know they can leave a message even on 'bad' days.
The hospital gave me a 'visual imaging/muscle relaxation' CD which I MP3'd and used whilst travelling to and from treatments.
Large boxes Kleenex ultra-balm man-size tissues for both patient and caregivers--use liberally when necessary and you don't risk a sore nose on top of everything else!
Brenda