Hi, Ed
My husband tried sugar on a whim and he said is was JUST like sand. All I can suggest at this point is thinking of Boost or Ensure as nutrition ... not food. Also, he drank the wretched things standing in front of the kitchen sink - was easier to get them down.
Although nothing will taste good for a while, you can probably find some drink that is less bad. My husband found my protein shakes better than Ensure, and Ensure better than Boost. He also did better with nature flavors - especially vanilla - than artificial ones.