Ancient texts which are part of the religious and spiritual heritage of India contain fragments about and refer either to urine therapy or to 'amaroli' ('nectar of immortality'). 

A few examples:

Hatha Yoga Pradipika 3;96-97:

"In the doctrine of the Kapalikas, amaroli is the drinking of the midstream, leaving the first for it is too pungent (too much bile) and the last, which is useless. He who drinks amari, snuffs it daily, and practices vajroli, is said to be practicing amaroli."

Gyanarnava Tantra, Chapter 22:
"After realizing the exact knowledge of dharma and adharma,every aspect of the world becomes holy - stool, urine, ovum, nails, bones, are all holy things in the sight of that person who has explored mantra. O Parvati, different deities are living in that water from which urine is made, then why is urine said to be contaminated?"

Harit, Chapter 1 on Urine:

"Human urine is basic, bitter and light. It destroys diseases of the eyes, makes the body strong, improves digestion and destroys coughs and colds."

Bhawa Prakasha, Verse 7, Chapter on Urine:

"Human urine destroys poison, properly used it gives new life, purifies blood, clears skin troubles, is sharp in taste and contains many salts."

Yoga Ratnakar, Mutrashtakam Verse 11:

"Human urine controls bile in the blood, destroys worms, cleans intestines, controls cough and calms nerves. It is sharp in taste, destroys laziness and is an antidote to poisons."