My (former) Company makes and sells trauma kits (which have many many documented saves), and also survival kits, which I doubt have saved any lives at all. I always wanted to put "hydration pills" in the survival kits. Actually, sugar pills with bold lettered instruction "JUST ADD WATER". In fact, the most useful component of most of those kits - in terms of size, weight and cost - are water purification tablets, either chlorine dioxide or iodine tablets. But they're useless too, if you don't have at least some tainted water to purify. A skilled survivalist can make fire under a wide range of conditions, but making water in the middle of a desert is a tall order...
Yup. Around here there is very little to put in a survival kit. There are no purification pills in my pack because I figure there will be no water. We had a
very snowy winter, we still have snow on our mountain but on a day hike the savings from using what little is out there wouldn't be much. I also don't carry one of the ten essentials--fire--because I figure any situation in which I felt the need of it would also be a situation where it was insanely dangerous. The real survival item is a PLB, SPOT or InReach!
You say iodine tablets--can you still get those? I thought they were a victim of the war on meth.