Water, and the brain power to use the resources that you find.
you need to be able to climb trees
If this is a deserted Island this is strictly a practical consideration. If this is an Arctic Island you will need heavy Arctic clothing If this is a tropical Island you will need clothing to protect you from insects, damage from the environment depending on what you need to do to survive. Shoes for example. Of course a Desert island would be different ;)
Water
the awnser is food and water
It would depend on the conditions you need to survive in. Cold weather gear would not be much use in the desert
This is because they need a lot of water 💦 in order to survive in the desert and they are not well made for deserts because they use quite a lot of water and they may die from heat .
It would depend on the conditions you need to survive in. Cold weather gear would not be much use in the desert
kinichiwa amegos
This isn't technology, but is tools; you would need protective clothing, lots of water, and information about how to survive.
Water, and the brain power to use the resources that you find.
Orcas require an ocean to survive and could not live in a barren desert.
fish