I can't imagine Kogasa would do it. What's the point in surprising someone if you're not around to see their reaction? It really doesn't seem her style. As for Tewi, I think she'd do it just to be a pain, particularly if she expected someone else to end up with the bucket afterwards and cause the kind of awkward confrontation that actually happened. It also really doesn't seem like Cirno's style on a number of counts, in my opinion. Plus, I'd think Kisume would have specified it was a fairy, and not just someone with blue hair, if that were the case.
EDIT: For that matter, what are you hoping to accomplish by tracking them down at this point? The bucket's been returned, Kisume is satisfied Murasa didn't do it, and went to apologize. And it's not like we're going to get any apologies out of most of the most likely candidates on the list, anyway. If they even admit they did it.