My husband found Ensure made hime very nauseous, Boost wasn't much better. He had good luck with NutriSource (I believe that is the name...it's been awhile) I ordered it from a catalogue the dietician gave us. It also had more calories than either Ensure or Boost, so he didn't have to take quite as much. As Brian said, the slow drip was also key. I believe I'd load the bag with all the cans (about 6 I think) in the evening and put the pump on a very slow setting to drip all night long while he slept (partially upright). The pump also fit in a nifty little backpack so that he could continue to drip food into the morning but still be mobile.

This nutrition stuff is difficult, I know, but also really really important.

Anita