Certainly turn off the water for now. Inspect the fitting for cracks. Do you have the tools to replace that fitting? It requires a crimping tool which you can rent in lieu of buying it for a one time thing. Just buy new fitting and re-install.
OR ... If not, there may be a chance you can apply teflon tape to the threads and re-install it tightly.
Get back to us on this one ...
Spraying water is a bad thing ...