Thanks for the quick answer!
I don’t care about what acid it is since they all do the same thing: freeing H3O+/H+. The main thing is vinegar is much stronger and easier to dose. I use a lot of peat and leaves for coloring the water and for enriching the pure RO water(H2O is really bad for organisms in pure form!) so I don’t think humic and tannins will be a problem.