Liquids like Ensure are exactly what I'm talking about, taken by mouth or through a feeding tube, rather than intravenous nutrition (TPN). Other brands people use include Modulen IBD, Vivonex, Peptamen, E028, etc. Some people take them as their primary treatment; others use them as you have, strictly for weight gain, or for growth in kids (and those, too, are important uses that I am covering in the book, and would love to have people's input on).
Ensure can work really well, by the way -- there have even been a few studies of its use to induce remission in Crohn's, but they were published back in the 1980s and few people are aware of them. I want all that information out there where people can find it, rather than having to dig it up in a medical library themselves!
Ides, thanks for passing along the message, and Peter, thanks for the reply. Sorry it won't be possible.
For anyone who's been following this thread, and would like to follow up elsewhere about the book project, I post fairly regularly on the Dragonpack board for parents of kids with Crohn's and a message there will find me.