The first thing I choose will be the first aid kit because if I'm injured, I will need this.

Then, I'll choose an axe because I need to use wood to do many things on the island

Next, I will choose a water bottle because I need water to live, too

The last thing I choose will be a lighter because I need to be warm at night

So, four thing that I choose will be

1. first aid kit

2. axe

3. water bottle

4. lighter