oh god..... what are you keeping him on? pet stores advices..... again..... that lady doesn't know much about pacs, that's for sure.

you DO need a heating device ( UTH placed on a side, heating lamp). pacman frogs are tropical species, they do need tropical temps. day about 76-78, night 80-82. never use heating rock, frog might burn.

water - the lady got it right, you need dechlorinator to treat your water and use it for everything, other option would be natural spring water.

substrate - take that thing you have asap, that is bad, very BAD for pacman, you need very fine coconut fiber- eco earth or plantation soil and use it exclusively.

plastic critter keeper is fine for now, when a frog will get bigger you will need to upgrade, i think it a month or two, don't rush now, small one is better for a baby.

be back tomorrow for the rest unless someone chime in sooner. the above that i noticed you need to fix asap, those are the most important things now.