Been there done that. I had a peg & pretty much refused to use it. I lost 50 lbs by the end of rad. Can he chug any liquid, like carnation instant breakfast in between throwing up. The chocolate with bananas blended in it at least tasted good even when I was so sick. I could not stomach the isosource, ensure, etc. For me they all had this underlying taste that just grossed me out. I used club soda to gargle & swish & rinse the mucous which helped a lot. I was the sickest, mentally & physically during those days & will never forget it. Nutrition & hydration in any way shape or form are essential - NOW. Anything he can get down, anything, is ok. If nothing else, he has to drink water as much as he can. I know he does not care right now, but down the road from this he'll be a lean machine & feel great once he gets back in shape. Don't fight with him, he needs that energy to heal, just coax him through. Nothing sounds appetizing to him right now, but he has to be in survival mode & just gulp, swallow, chug anything he can. He is in some dark days right now & my heartache goes out to him, but this is doable. Tell him if one man can get through this then so can he! Erik