Hi,
Please keep in mind that leaving water out for 24 hrs or so will allow chlorine to dissipate, but chloromines, used by many municipalities, will remain. Most standard instant chlorine removers (liquids) take care of chloromines as well, but check label or let me know if you need a product name. No need for bottled water, some is quite hard, unless a pH/mineral prob with your tap (easy to check via local water municipality). The Bx Zoo and others in which I've worked used instant dechlorinators for almost all, untile RO came into vogue (reverse osmosis systems). If you use distilled on glass, take care not to spray frogs..may leach minerals, salts from body.
Diet is a very impt consideration for this species...you might enjoy this article The Red-Eyed Treefrog - Notes on Captive Care and Natural History | That Reptile Blog.
best, Frank