Urine, as distasteful as it may be, has quite a few 'survival' uses. As a material it isn't all that bad. Assuming you don't have a kidney or bladder infection urine is sterile. It is a natural mild astringent and antibacterial or bacteriostatic agent.

It, obviously, comes out warm. It is readily and regularly available in fairly large supplies.

Medical uses:
A pretty well known use is to use it on your own blisters and other raw, debarked, skin. The uric acid and ammonia cause the tender exposed tissue to skin over and to stop stinging and burning.

A related use is to keep intestines or other vital tissues wet so they don't die. Normal saline is generally preferred but given a lack of clean water or other options and exposed intestines that will soon dry out and die urine has long been