you need following:
-tank - you have it!
- something to cover 3 sides of a tank, aquarium type background would work perfectly
- fine coco fiber ( exo earth, plantation soil), or similar
-shallow water dish, so a frog can hop in and water level would be no higher then frogs chin
-Ca/vit3 powder and multivitamin powder - you probably have both since you have sal.
- heating UTH attached to the side or infrared lamp, anything, I prefer lamps as they would turn on and off faster if plugged into controller.
- fogger, misting bottle, you probably have something
- i highly recommend getting Hydrotherm and plug it into your heating lamp and fogger - it will make your life much easier and you never will need to worry about humidity and temps.
- some kind regular low voltage lamp to provide day/night cycle.
- any water conditioner for fish or reptiles/amphs, currently I'm using Prime. I've seen only reptifresh by zoomed, it is not intended for water, but there might be something else
- plastic plant or some kind of decor to make tank not so empty.