safer to drink the golden wine
best and correct answer.
If I was stuck in the middle of the ocean I most likely would be a vampire anyways so I wouldn't mind the blood! I'm not going to venture out into the ocean without a plan so if you're trying to trick me into getting stranded then you're a fish out of water.
It would be better to not drink anything. Sea water will make your body more dehydrated and you can't drink your own blood. That basically means you are killing yourself.
Where would you get blood from?
Think raw fish would be OK.
So Mr Polar bear fingers, How do you intend to catch the fish while bobbing about in the ocean?