I have used it before....both Distilled water and bottled drinking water...but only in an emergency and I dosed a water clarifier to take out the chloramines. Ummmmm definitely not worth the unwanted cyano I got from it more times than not. But, didn't kill anything.

That's what I get for not having an RO/DI unit YET!

Definitely try not to do that often. I tote 5 x 5gal buckets to the LFS every week ....ugh.....