Maybe I am too much of a skeptic, but I think that the acid rain thing is about the same as the mercury in fish scare....

I mean, there are rivers I wouldn't eat the fish out of, but even the wild fish around here they say not to eat more than one meal of them per week. I eat more like 4 or 5 meals of them per week in the summer and I am fine! (Aside from being a little insane, but that is genetic rather than environmental haha.)

Likewise, I wouldn't be afraid to drink rain water out in the countryside. I don't think I would in a smoggy city (more afraid of the contaminants it would pick up on the way to the rain barrel than when it was falling through the air, though). We used to have to till some lime into the soil here to counteract the acid rain back in the 1980s, but the air and water is far far cleaner now than it was then, and we don't have to do any of that anymore. I figure as long as it's not screwing up the PH of the soil, I can probably drink it.

But I dunno. I guess if I set up a rain barrel and then die, we'll know for sure. XD