In the context of taking words to their original root(s) meaning, ''Water'' and ''Shari'a'' have a very close relationship. For the Arabs of Muhammad's time (Sallallahu alaihi Wasallama), just as in Biblical times, and for all people for whom water is precious and scarce, society revolves around places where water could be found: wells, watering holes, oases. One's very life depended on finding and following the paths of water. Hence some of Islam's primary technical terms are water-based.
Shari'a commonly translated as Law, originally meant the Way to the watering hole...and in Sufi parlance, we may say, the Shari'a is also the path to the water of Divine Life. The path of water, the Shari'a, is a path of action--practice based on a revealed knowledge that descends like rain from a pure source and is received in purified receptacles: the Messengers, Prophets and Friends of God. The Sufi is ever thirsty for this knowledge, ever seeking to be quenched with the waters of Divine Life. It is a thirst to be cultivated rather than satisfied. As Jalaluddin Rumi says:-
''Where there are questions, answers
will be given; where there are ships,
water will flow. Spend less time seeking
water and acquire thirst! Then water will
gush from above and below''.