If the audio and text are slightly out of sync when you play the file, most media players (like VLC) allow you to adjust subtitle delay using the G and H keys.
To get the actual .srt text file for this specific release, you can check these common subtitle databases: subtitle The.Mountain.Between.Us.2017.BRRip.Xvi...
OpenSubtitles: Search for the 2017 title and filter by your preferred language. If the audio and text are slightly out