I can see how drinking rain water would be a life saver when you’re out in the middle of nowhere and your options are limited. On the other hand, drinking rain water that’s collected from your gutter doesn’t sound too refreshing. That’s what Rain Drops, the cheap rainwater harvesting system, proposes.
It’s essentially a series of two liter cola bottles connected to your gutters. Which means, all of that fine bacteria that not only pollutes the skies but also builds up in your gutters, will now be in your drinking water. That’s not to say that tap water is much better than rain water, but if you’re going to be drinking it, you might want to add some sort of sterilization procedure in to the whole design.