Our water, מים שלנו, is an insider's term in AKBAN's belt exams for the water usually drank after a successful black belt exam. These water are carried in a backpack from a desert spring, at the desert gathering, and brought on foot, in special bottles for the ceremony at the end of the exam.
The instructor then says:
"This is our water, we carried it on our backs, you now have to do the same, you owe us water, now our water is your water. "
"Our water" ceremony from 2014