Hello again @RicoR, great question and one that other forum members have wondered about too.
Hope you don’t mind but I had a look using the search box at the top and found this thread which has loads of great tips about what can help whilst in hospital: Stem Cell Transplant Shopping/Packing List
I’ll also share a link to this lovely post from dear @Ceri_BloodCancerUK with lots of information about neutropenic diets, hospital tips and many other ideas: Stem Cell Transplant Recovery MM - #2 by Ceri_BloodCancerUK
I wonder what your friend says he needs? Some treatments require or benefit from special neutropenic diets, but it’s worth asking if your friend has any foods or skin products that he needs to avoid first.