watering plants with light coffee

what do you think?
if you have RO... too pure... pH slightly high...growing organic... make some light coffee (organic of course) and measure ppm and water away..
coffee grounds are suppose to contain N and Mg.. should double check that

I've given my plants leftover coffee and they liked it!
(Food for mycorrhizal fungi.)

yea its good, i add coffee to my soil. i water in peppers with coffee and they like it.