In most survival courses what is taught is, if you are presented with a situation where you have no fresh drinking water a available.
There are a few ideas on the topic, some say that it is too salty since your body is secretting its own salt content. Therefore it would not be a very good option. But if boiling urine or filtering the urine to remove the salt that could help if no other potable water were present.
This they claim is a last resort, but many mariners throughout the ages have done this to survive.
What do you think, could you do this if it meant your life was on the line?