Thank you for the help Amy. I used to drink pedialyte myself when I used to play recreational tennis. I guess they have un-flavored pedialyte water? I will go see what my grocer has, as well as some un-chlorinated water. I have a big bucket near the potted plants that I let fill with rainwater, and used the water from that earlier.

The frog before wasn't noticeably breathing before - that is to say, I didn't see the puffing of the sides of his abdomen like frogs normally did, even though he was clearly alive and moving. But when I went to check on him after posting my OP, I saw him move a little and his sides breath in. Maybe that's a good sign...I'll hope anyways. Thanks again!