My survival kit:
1.Water purification equipment
2.Ignition tool
3.Knife
4.First aid kit
5.Flares
If we have to live on a deserted island for a week or two, we really need water, but on a deserted island we won't have clean water and if we bring water it won't be enough for you to survive for four days. so we need to bring water purifier. On a desert island, we also need fire to cook food, but for the fire to be big enough to cook food, we need an igniter. We also need food to survive on the desert island, so we need sharp knives to catch fish for food and many other uses. And to prevent injury, we need a first aid kit that can help us heal wounds and avoid infection. And when the rescue team has arrived but unfortunately they can't see you, now use your last item which is flares and those are pretty much the best survival items I know.