Used in this way, “believe” is what the advertising industry calls a weasel: it sounds like a claim, but doesn’t quite say what it sounds like it says, so the advertiser remains legally safe. That is, they didn’t outright say the water tastes better. Only that they believe it does.
Thus we have this gem, taken verbatim from the Arrowhead website (I added the italics): “We believe our spring sources, bottling process, and our dedication to giving customers the most refreshing product possible are what give Arrowhead Brand Mountain Spring Water its remarkable quality and consistently great taste.”
Weasel, weasel, weasel.
I am aware that Arrowhead contains minerals. It’s conceivable that you could taste them. But if you truly can taste them, then Arrowhead should be able to demonstrate as much by means of a controlled, third-party, triple-blind test. The fact that Arrowhead chooses to weasel instead suggests that their claim is bogus—and that they know it.
Sadly, the human mind readily fools itself. Doubtless a number of people, after hearing or reading Arrowhead’s tripe, will sample the product and convince themselves that it really does taste better. Which, I suspect, is exactly what the devious folks at Arrowhead hope.
Such practices help give advertising and us advertisers a bad name. As if we needed any help in that department.
Minerals aside, water is a parity product. There are other, ethical ways to sell party products without resorting to weaseling. After all, I would be hard-pressed to tell you the difference between a “weasel” and an outright “lie.” Without, that is, resorting to weaseling myself.