I'd think about it carefully and see if it had some plausible scientific explanation. I'd look at the cost of trying it and the cost of not trying it. And then

I'd think about it carefully and see if it had some plausible scientific explanation. I'd look at the cost of trying it and the cost of not trying it. And then I'd try it for a month or not. It's a month! In a lifetime, it's not a long stretch of time. If there's a real benefit you win, if there's no benefit you learned something. (Keep in mind the above line on considering costs and whether I'd do it in the first place -- that's meant to put a bound on costs.) There are probably places in the US where switching to bottled water would be a great idea, sadly. Northern Iowa, for instance, is struggling to remove nitrates from its drinking water (nitrates affect oxygen transport by blood), and in parts of Pennsylvania fracking has led to flaming tap water. If you live there, it might not be a bad idea to try your example of a silly experiment.