If you spend a lot of time in the outdoors, you probably already have a lot of this gear, but here's a sample of what went into my bag, when flying in Alaska.
Information can be found online about what is required. A survival kit is absolutely essential.
My survival kit includes equipment for :
First-aid medical supplies
Water, Food (for 1 week) , Fire
Navigation & Communication (signaling flairs, 2-way radios/batteries, maps, compass, etc)
Protection from wildlife
Thermal protection clothing