I put a few survival items into a dry bag, which can be clipped to my PFD when conditions are dicey. They were formerly in my daypack. I keep the drybag in my daypack when conditions don't merit having it out.

One item I added is hand sanitizer in a 2oz bottle. In addition to the obvious use, it can also be applied to wounds, as an antibiotic, and because of it's makeup, is also an excellent fire accelerant. ;)

I also added a 12oz stainless steel mug to be used for boiling water (soups, coffee, bouillon), as well as a mug.