Each hydrogen atom in water has a magnetic moment, which is associated with the proton's spin of ½. As is found in molecular hydrogen (H2), the protons (within the hydrogen atoms) in water (H2O) may possess parallel or antiparallel nuclear spin. Every water molecule in the universe is either a para-water molecule or an ortho-water molecule. Para-H2O does not interact with an external magnetic field, but ortho-H2O does. Then water can be influenced
as the colleage mention, I will add, that we extract energy from the diferent salinity gradient (Blue Energy), so it is possible o influence the water with some salts in it, so with Entalpy Gibs ecuation, you even can measure the theoretical effect of such influence.