Mynameislame oberved, " Interesting point, I don't ever remember that being discussed. We always used to use Kosher wine and unlevened bread for the memorial."
I'll admit that during the 20-odd years I was a Dub this never occurred to me, and I consumed Kosher foods without giving it a second thought.
It would be kind of interesting to hear the Watchtower's weasel-words on this issue of Pure Worship™.
Now I'm a free atheist and don't worry none about what superstitious people do.