I live in a garden house, and I haven't yet got water supply.
I do, however, have a roof drainage gutter thingy (English?). So I wondered, could I spray rainwater into my snakes terrarium. I don't do that very often, but hauling water around all day does get annoying after fashion. My chameleon does need water a lot, so same question for him. I live in the middle of Amsterdam, so pollution is inevitable, but would it be very harmful?

Thanks