It wouldn't be a bad idea to keep the bowl of water even after his infection has cleared up! They tend to be much easier for hedgehogs to drink from than water bottles, and they're also easier to clean daily. Water bottles should also be cleaned daily, but it's harder which can make it easy to skip on.
It sounds like you're doing great with him so far, so just try to relax!
You've done everything right in this situation - got him a heat set up, got him to the vet to get checked out, and you're getting him treated. I'm sure he'll be back to normal in no time.