Agree about signaling. My first choice for additional gear would be a signal mirror - small, light, and highly efficient (if the sun is out). I would upgrade your match case or wrap the head with tape. The case you have is fine, but I have had the top unscrew on me, not good

I would opt for a small, light metal cup or pot rather than a water bottle.

As much of this gear as possible should be on your person, daintily tucked away.

In your situation, wool clothing is going to be a lot more suitable than synthetics (fire hazard), Dress on the warm side as much as possible.