For me, it was to always bring a big water bottle (or two smaller ones).
I just got back from a hike on one of the hottest days of the year where I ended up walking around 3 hours and several kilometers after running out of water during the hottest part of the day before I could get to a churchyard with an outdoor tap to fill up on. Not fun!
A GPS device like a Garmin InReach that can send out an SOS even when there is no cell signal could very well save your life.
That actually a very good shout. I rely on my phone a little too much for emergencies. Thing is, I’ve done a fair bit of sailing and would hardly think of leaving harbour without at least a radio and usually a EPIRB but never thought about it much with hiking.
I’ve been listening to the Out Alive podcast for a little while and it’s amazing to me how many of those scenarios could have been resolved much quicker had they been able to SOS.