One things these kits leave out is water. At the very least put in 2 heavy ziploc bags and a small dropper bottle of bleach.
In my kit I do have those
Even in movies and TV shows from all eras, they throw away their canteen when it is empty, with never a thought that even finding a lake, they can only benefit to the extent of drinking while sitting there, since they have no means to take some with them.