Head & neck cancer what to feed him?

Hi my  husband is on day 4 of 30 radiotherapy, he ahs had 1 of 2 chemo. I'm struggling to get soft snacks that he will eat. Not sure if he's scared or just can't tolerate anything that isn't soft and smooth. We've been told he needs to eat well and sufficient but I just can't find any snacks he will eat. He's been feeling sick after the chemo which hasn't helped although seems to be getting through this. Any advice for 'grazing'?