Hi Tammy; With this first month post-rad over the recovery should start to kick in for real. At last, something good to look forward to.
As you've probably read, it is a slooowww process taking many months not weeks. Ten months out I still have very little saliva.
As for nutrition, everyone seems to have their favourite drinks, usually discovered thru trial and error. Some things are yummy for two weeks then your taste buds will change again and it taste awful; eg.I love bananas now, but for many months they tasted like iodine to me??
Simple plain flavours are the best to try, Chinese noodles and soft poached eggs went down well at first as well as diluted vanilla flavoured ensure for calories. The full strength stuff was too thick and made me gag.
Find out what he likes and keep trying, we need that nutrition to heal our frizzled tissues.
All the best,
Fran