See some confusion here on thread due to all the commercial names on human's bottled water and de-chlorinators/conditioners so will try to resume. Please be aware that water names might mean different things across nation lines.

Water

Tap - de-clorinate and use for bath water or water section. Chloramines (present treatment at water plants) are more stable and will not leave water by aerating for 48 hours like with plain chlorine!

Boiled Tap - same as tap with little to no oxygen. Still need to de-chlorinate.

Filtered (bottled or home filter) - depends on filter medium (some are carbon based others are mineral based). Similar to tap and should be de-chlorinate the same way. Some minerals might be removed by filtration.

Mineral - water filtered by mineral medium (see filtered).

Distilled - use only for spraying enclosure (leaves no spots on glass). Do not use for frog bath!

Reverse Osmosis (RO) - leave this for saltwater tanks, do not use on frogs bath!

De-ionized water - de-mineralized water, do not use on frogs bath!

Other processes like micro-filtration, ultraviolet oxidation, electrodialysis, etc.; do not use on frogs!

Water Treatments

De-chlorinators remove chlorine and not more. Conditioners can add capability to remove heavy metals and even Nitrates from water. Some conditioners have chemical additives to interact with a fish slime coat. Recommend stay with de-chorinators or conditioners that do not add anything to your frog bath.

I've used Seachem's Prime in the past and now use Seachem's Vitro (saltwater line) "Alpha" because it's more concentrated and cheaper in the long run (also removes Ammonia and detoxifies Nitrites & Nitrate from tap which are present at my location). Any product labeled as safe for frogs is probably good!

There are new products in market labeled as all natural de-chlorinators based in vitamin C . I bought one online (SuperBac All Natural Dechlorinator) and tried it with my fish. The cichlids were very stressed after a normal 25% water change. Did some analysis and the product was removing chlorine, but something was not right and I do not mess around with my pets. Contacted manufacturer by email and described my experience; but the lab technicians never answered. So I dumped the whole 16 ounces down the toilet. After my experience can't recommend those vitamin C based products. Good luck !