@g4project - The composition of urine is pretty much just water, with a few dissolved salts and other impurities. So, it can be almost completely transformed into drinkable water.
However, both of the methods described above (which are classic survival methods of distillation) will result in some of the water being lost. They both rely on the water in the urine being transformed into vapor to separate it from the impurities. Inevitably some of the water vapor will escape because in a survival situation you wouldn't have the equipment to catch it all. How much depends on the weather and other factors.
In lab conditions you could probably make close to 100% of the urine into water. I think they do that on the International Space Station for example.
In a survival situation you can also use these methods to distill salt or unclean water, which people might find less disgusting to think about than urine.
But, if nothing else is available, you should do what you can to survive.