I'm looking for something measurable, reproducibly so, showing a physical change due to the presence of a magnetic field.
Individual "tastes" can vary, some people prefer Marlboros, whilst others like menthol brands like Salem and can't stand Marlboros. Some hate sardines and liver, while others like both, etc yada yada yada.
Best would be to do a controlled blind experiment where neither recipient nor provider know the identity of the materials. Supplier X provides Brand A "magnetized", Brand A non-magnetized, Brand B "magnetized" and Brand B non-magnetized. And a Brand C, same thing. Then you maybe get some meaningful results.
Even old water tastes different, put a glass of distilled water out to the air overnight and taste it, verses a freshly prepared sample.