Oh, of course, my bad. Aside for the Goddess 0.1 Pelinobius muticus PBUH (Peace Be Upon Her). She's a Goddess, therefore screw the wallet! I use for her onlyFillico Luxury (Osaka): 195 Euro for a 750 cl. bottle. Everything for my baby
I use distilled water because it doesn't leave ugly water spots. With enough water stains, you can barely see your T after a while. My arachnologist friend is always making fun of me for my "fancy" enclosures. But hey, pretty spiders need pretty homes!
Tap water right now. I used filtered water when I had a reverse osmosis unit installed at my kitchen sink, and when we move, I'll have one installed again. Since we rent at the moment, that's not an option, and I don't have room to store gallons of water.
If you think 24 hours is long enough to let tap water sit out... I leave you these links from fish keeping sites (people who must consider the condition of their water or else they have dead fish). Most city water has some manner of chloramine added to it, which does NOT evaporate: Linky One Linky Two Linky Three Linky Four
I use dechlorinator w/tap water since I have it for other animals, but I don't really think chlorine or anything else in tap water bothers T's. I also used bottles of spring water for a while that had be opened, but left to be wasted from others in the house.