system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 They say if your stranded at sea not to drink the salt water because it will kill you faster, however dehydrated patients are given saline drips. Why?

Is it somehow different? Is it the concentrate?
gpt
On average, seawater in the world's oceans has a salinity of about 3.5%. Sea water also has all sorts of other stuff in it. 

Normal saline is the commonly used phrase for a solution of 0.90%. Saline contains water and salt.