With Sparking water today we sampled:
2007 Chenin Blanc, Morgenhof Estate,
2007 Viognier “Villavieja”, La Agrícola,
2007 Maria Gomes, Luis Pato, Bairrada, Portugal
2007 Viognier, Vin de Pays des Collines Rhodaniennes, Domaine Yves Cuilleron
Hmm, curious and a little frustrating as it would have been lovely to have drawn a line under it and said "wow, it is simply the grape variety that matters!", but then, wine is a little more complicated than that isn't it...
Having said that, there are instances in which the same water has been recommended with both wines, so I think that this may prove to be the key. If we can find waters that consistently pair well with certain grape varieties, then not only will we be able to incorporate these into wine menus with a high degree of accuracy, but from a scientific perspective, we shall be able to understand which key combination in minerals is necessary for consistent wine-specific matching.