As 200xth said, tap water is fine, and distilled water can actually cause problems with leeching out of trace minerals etc from your pets. Tap water is fine, and leaving out a bucket or jug overnight to let the chlorine evaporate (if you don't filter your water) should eliminate the biggest issue.
Or you can treat the water like you would for fish - water treatment drops are fairly inexpensive.
-Jen
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