Hi Rosa,
Definitely stock up on water and comfy clothes, tops that pull over your head easily and hoodies that zip up. Get vaseline or lip balm as you will get dry lips from breathing through your mouth. Face wipes and wet wipes are really handy to have. Dry shampoo, hair clips, bobbles. Loads of people get a v pillow for sleeping upright, I bought one that was too firm and only used it once so get a comfy one if you can. Hope this helps. Who is your surgeon? x x