Waheguru Ji ka Khalsa Waheguru Ji KI Fateh.

Amrit..and all its components have been described in GURBANI..and from the Guru sahibaans as well as the Bhagats who came earlier than even Guru nanak Ji Sahib.
Guru Gobind Singh Ji "conceptualised" the Ceremony..Khande Batte da Amrit by Panj Piayars as He intended to Install Guru Garnth ji as the Final Guru and end the line of Human Gurus...But ALL the ssential Components of Amrti are already in the GURU GRANTH SAHIB JEE. It couldnt be farther from the truth to say that Guru Gobind Singh Ji is the one who "began this Amrit" ceremony and before this there was no such Amrit.

In a worldy sort of simplixtic example it could be said that...Guru nank jI Sahib started the SIKH SCHOOL....and each succeedign GURU Sahib added to an improved the Educational/Practical matter/subjects, curriculkum etc...and GURU GOBIND SINGH JI completed the UNIVERSITY of SIKHISM and showed us how to "matriculate". It is perfectly understandable if a few students NEVER even enter the School even at Kindergarten level, some drop out at various classes, some REACH UNIVERSITY but attend a year or two and drop out..Some reach Final Year BUT FAIL..etc etc...BUT that doesnt mean that the FEW "KHALSAS" who do graduate with First Class Honours shoudlnt be called Graduates !!
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-sikhi-sikhism/5232-amrit-is-it-for-everyone.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=5232

I am a teacher and so used this example. It is true in every sense. IF anyone does enter the Sikhi School, its EDUCATIONAL SYLLABUS is the GURBANI..and Once the Student has FULLY IMBIBED the GURBANI in hsi/her daily LIFE...He is then Competent to Take the AMRIT EXAM..and pass out with Full honours...BUT remeber LEARNING..SIKHI sia life long process and just passing out is still NOT the End all and BE all of Sikhi... the REHIT has to be kept every moment till death.

Jarnail Singh Gayni