I've got a whistle, but haven't used it, ever.
Lights- I have a photon, a headlamp with lower light output that last really long, and my main that lasts a few hours. I try to use the Headlamp that runs on 1 AAA & doesn't put out loads of light the most. When I need to really light up things after dark, I use my ZebraLight, it is incredible. When I researched lights for my pack last year, this light was recommended by all the light enthusiasts across the web...here is a link...
Lighters- I have some waterproof matches in a sealed container. Never use them. I use my Windmill waterproof & Windproof lighter. Fast, reasonably light, clear SO as to see if it is getting low on fuel, and has never failed me. Here is a link...