Type of water for terrarium?
 

I'm setting up my orchidarium, the question I have is what type of water to use.
Can I use tap?
If not, can I treat tap with some conditioning agent to make it acceptable?
Or do I need to acquire distilled water?
Thanks.

RO-wather or rainwater

tap-water will make the glass dirty and nasty

Agreed. I use pure RO water.

I use RO water too

Like the above posts, go with RO water to ensure that your setup lasts longer. When tap water evaporates it leaves behind minerals and certain chemicals that will eventually build up and harm the plant life.