The book idea is great, I also bring a book with whenever I'm likely to have down time.

Bonus - it's amazing how much respect you get for doing ANYTHING other than scrolling on a phone.

Instead of a paper book, I bring a kindle. I use the old-style kindle, with buttons, no touchscreen, no wifi. So, it's basically a book, with zero ability to browse the web.

I put books on it via a cable, using Calibre. The model is Amazon Kindle D01100 4th Generation. You can get them on Ebay for $15 to $25. Loads of books are available through libraries.