Urine is mostly made out of water but has 3,000 other components.

Urine is about 95% water, about 3% urea, which is a compound created by your body's breakdown of proteins, then some sodium, creatinine, potassium, and chloride. There are also smaller amounts of other compounds at much lower concentrations.Basically, there's a whole lot of stuff in there that wants to leave your body.