urine is sterile.

Sterile, but chock full of expelled toxins, salts, and other ♥♥♥♥ you don't want in you. Think eating polar bear liver.

Composition

Urine is a transparent solution that can range from colorless to amber but is usually a pale yellow. Urine is an aqueous solution of approximately 95% water, with the remaining percentages being metabolic wastes such as urea, dissolved salts, and organic compounds. Fluid and materials being filtered by the kidneys, destined to become urine, come from the blood or interstitial fluid.

Urine is sterile and nearly odorless. Subsequent to elimination from the body, urine can acquire strong odors due to bacterial action. Most noticeably, the asphyxiating ammonia is produced by breakdown of urea. Some diseases alter the quantity and consistency of the urine, such as sugar as a consequence of diabetes.
[edit] Hazards

Urea is toxic and can be irritating to skin and eyes. High concentrations in the blood can cause damage to organs of the body. However, after suitable processing (as is done, for example, on the International Space Station), it is possible to extract potable water for drinking.

Hazards

Urea can be irritating to skin, eyes, and the respiratory tract. Repeated or prolonged contact with urea in fertilizer form on the skin may cause dermatitis.

Too high concentrations in the blood can cause damage to organs of the body. Ingestion of low concentrations of urea, such as are found in typical human urine, are not dangerous with additional water ingestion within a reasonable time-frame. Many animals (e.g., dogs) have a much more concentrated urine and it contains a higher urea amount than normal human urine; this can prove dangerous as a source of liquids for consumption in a life-threatening situation (such as in a desert).

Urea can cause algal blooms to produce toxins, and its presence in the runoff from fertilized land may play a role in the increase of toxic blooms.[6]

The substance decomposes on heating above melting point, producing toxic gases, and reacts violently with strong oxidants, nitrites, inorganic chlorides, chlorites and perchlorates, causing fire and explosion.[citation needed]

So:
Don't drink smelly, pure yellow urine. (Lots of bacteria, etc)
Evaporate urine and drink the resulting water. (You guys know what I'm talking about, right?)
Don't drink dog urine.


None have your actions have been to drink water, right Tomaster?
Where is the water coming from?