Spoiler
22L Water
24 Chocolate Bars
2sqm Black Plastic
1 Survival Meal

Small Transistor Radio
Shaving Mirror

5m Nylon Rope
Seat Cushion
9L Oil-Petrol Mix

Maps of Pacific Ocean
Sextant

Fishing Kit
1L Rum
Mosquito Netting

Shark Repel

Spoiler

1. Fishing kit
   
2. 5 metres nylon rope
   
3. 2 square meters of black plastic
   
4. Shaving mirror
   
5. Maps of Pacific Ocean
   
6. Sextant
   
7. Small transistor radio
   
8. 22 liters of water
   
9. 1 survival meal
   
10. Mosquito netting
    
11. 9 liters oil-petrol mix
    
12. Floatable seat cushion
    
13. 24 chocolate bars
    
14. 1 litre 20-proof rum
    
15. Shark repellent

Spoiler

1. 22 liters of water
   
2. Fishing kit
   
3. Sextant
   
4. Small transistor radio
   
5. 5 metres nylon rope
   
6. 2 square meters of black plastic
   
7. 1 litre 20-proof rum
   
8. Maps of Pacific Ocean
   
9. 24 chocolate bars
   
10. Floatable seat cushioni
    
11. Mosquito netting
    
12. 1 survival meal
    
13. Shaving mirror
    
14. 9 liters oil-petrol mix
    
15. Shark repellent

Spoiler

Quote:list:

water
sextant (if you know how to use it. that way you can navigate towards land and tell people on the radio about where you are)
radio
shaving mirror (to signal planes)
seat cushion (floatation)
nylon rope (rescuing people that fell off)
survival meal
bug net
map is okay i guess but the sextant probably won't give you a good enough guess for your location so a mental map would probably work just as well
black plastic might work as shelter from the sun in a pinch, though it would also be really hot

bad useless things:
oil+gas: cooking with that could poison you
fishing kit: raw fish could poison you
rum + chocolate: will make you thirstier
shark repellent: really unnecessary

Spoilerwater
survival meal
mosquito netting
shaving mirror
oilpetrol mix
maps
small radio
seat cushion
black plastic
chocolate is a last resort of food
rum is a last resort of drink
rope
fishing kit
shark repellent
sextant

Spoiler
1. 22 litres of water
2. 2 square metres of black plastic
3. Small transistor radio
4. Fishing kit
5. 24 chocolate bars
6. 5 metres nylon rope
7. Floatable seat cushion
8. Mosquito netting
9. 1 survival meal
10. 1 litre 20-proof rum
11. 9 litres oil-petrol mix
12. Shark repellent
13. Maps of Pacific Ocean
14. Shaving mirror
15. Sextant

Spoiler
Sextant
Small transistor radio
2 square meters of black plastic
1 litre 20-proof rum
9 liters oil-petrol mix
Floatable seat cushioni
22 liters of water
Mosquito netting
24 chocolate bars
Shark repellent
5 metres nylon rope
Shaving mirror
Fishing kit
Maps of Pacific Ocean
1 survival meal

Spoiler1. 22 liters of water
2. 2 square meters of black plastic
3. 5 metres nylon rope
4. Fishing kit
5. 24 chocolate bars
6. Shaving mirror
7. 1 survival meal
8. Small transistor radio
9. Sextant
10. Floatable seat cushion
11. 1 litre 20-proof rum
12. 9 liters oil-petrol mix
13. Maps of Pacific Ocean
14. Shark repellent
15. Mosquito netting

SpoilerVital Survival Stuff:
1) 22 liters of water (Dehydration is the biggest worry. Drinking pee works at most once, in an emergency, I think.)
2) 2 square meters of black plastic (Keeps the sun off, and keeps heat in at night. Catch rainwater.)
3) 5 meters of nylon rope (Secure black plastic, which is very important. Useful on land)

Communications and Rescue:
4) Shaving mirror (Visual signalling)
5) Small transistor radio (Alert folks to your existence for rescue, hear if others are near)
6) Maps of Pacific Ocean (helps with rough sun-based navigation)
7) Sextant (Ideally with instructions? Could tell rescuers where you are, or find an island)

Improve Survival Chances:
8) 1 litre 20-proof rum (Disinfecting wounds, water, etc)
9) 24 chocolate bars (Easier to ration out. More calories than a survival meal)
10) 1 survival meal (Still got a lot of calories)
11) Fishing kit (Not a guarantee of food, but could help, esp if you find an island.)
12) Mosquito netting (Near-surface fishing? Keep bugs off near land?)
13) Floatable seat cushion (emergency float?)
14) 9 liters oil-petrol mix (Signal fire? Probably not good for cooking)
15) Shark repellent (Basically useless. This is not Batman)