Wikipedia tells me that this whole “ice-nine” thing is actually a thing. Although in the real world it’s referred to as Ice IX and is only stable in a small range of temperatures and pressures in a lab. None of which are reproducible inside a thermos, so you can’t travel with it or use it to keep your drinks cold. Vonnegut certainly managed to run with an unusual scientific idea when he wrote this novel, in addition to creating a whole religion for it. But it’s not a difficult book to read. Vonnegut makes the plot and ideas easy to grasp by breaking everything into little chunks. And I do mean little, there are many chapters which are less than a page long. In those cases the next chapter also starts on that page, minimizing disruption. The challenging part is the ending. If you’re committed to having everything tidied up and neatly put away by the end of your reading experience there’s a chance you won’t enjoy this book. Maybe try it anyways? It’s short, interesting, and who knows? Vonnegut could surprise you.