the best thing to do is to try a little bit of everything until you find what agrees with you. I found that in Wendy's chocolate frosty. Half a small one would be enough to satisfy me. As I said before, the trick is to try very little at first.
Most everything else tasted bad. Sometimes one scrambled egg satisfied me, at other times it did not. Plain spaghetti with a little butter/margarine was good most of the time. Also sucking on a piece of frozen fruit.
Remember, little portions. Good luck and be well

marciak9:
My wife @kim1965, is starting her 9th cycle of chemo (by pills), and has had alot of what you are experiencing. Her go to over the 9 months, has been the Oreda Instant Potatoes (4 different flavors available), not sure why, but it goes down easy and is easy on the stomach. #2 on that list, is watermellon, although I heard some say watermellon can cause diarrha, so you are already experiencing that, so you might want to be careful there. Hope this helps?