Mr. Norton, I enjoyed reading your review. Unlike you, I saw it on my paltry 65" Vizio P65. In spite of my (better-than-local-theater)Atmos setup and superior brightness (in Dolby Vision as well), I sorely missed the big screen experience. Even my wife commented that it was the first time she'd noticed that our TV felt small. I still intend to see it in the local IMAX as soon as possible.
Also unlike you, I've read the book (but haven't seen the Sci-Fi channel miniseries). I don't remember any scene with Jessica and Arrakis' water, but that's not to say it didn't happen. The movie is generally very faithful to the book; the only significant difference I noticed is that Rebecca Ferguson's Jessica is much a much more fretful character than her source material. The Jessica of the book is aware of the dangers but reacts seems to be less riddled with angst.
Although it felt a bit hollow in places, I also really enjoyed the film, and I'm really excited to see the second half (and the first half, again).