D&D Beyond allows printing. You can use "Print to PDF" on each chapter to compile your own legally downloaded PDF for personal use.
When searching, use exact-match phrases like: d amp-d out of the abyss pdf
The party starts with 10 NPC prisoners. That is too many. Use the PDF to review their stats, then kill most of them in the first escape. Keep only two or three favorites (such as Stool the myconid sprout or Jimjar the gnome gambler). D&D Beyond allows printing
Q: Can I purchase a physical copy of Out of the Abyss? A: Yes, a physical copy of Out of the Abyss is available for purchase from online retailers and local game stores. That is too many
To help you dive into this campaign, I can provide more specific details if you tell me: Dungeon Master looking for plot hooks or a creating a character? to use for the Underdark? available in the module? Let me know how you want to explore the abyss.