Finally turned that epic of a summary from the mission control center tours into a link. But maybe the damage has already been done and no one read my JSC post because of its massive girth (or maybe because it's only interesting if you are a space nerd).
But anyway, I remembered that one of the astronaut trainers told us that astronauts actually don't eat any of the "astronaut food" that they sell at science museum gift shops, especially not the freeze dried ice cream. It's all a big scam! They do, however, indeed drink Tang (though for them it's called simply "orange drink").