If you spend on bottled water, you apparently haven't yet been swayed by the "water is water" argument. But how about this one: Bottled water is bottled water.
Mineral and/or carbonated water is different, of course, but if we're talking about regular old "purified water," the store-brand water is just like the brand-name stuff. Both contain H2O molecules; both went through the same types of purification processes; and both quench thirst and taste, well, like water. The only real difference is that the name brand (which, unless it's labeled as "spring water," is likely from the tap) can cost twice as much.
Next: Save on seasoning …