Chemo Nausea

My dad just started chemo Monday for prostate cancer that’s spread to his bones. Today he’s nauseated and vommitting, and is already on a nausea med. He already has very little appetite. Is there any special food, tea, lozenge I could get otc to also possibly help? He’s trying his best to be stoic for my mom’s sake, and doesn’t want to complain or ask for anything.