Long story short, I can imagine doing something like this could be somewhat complex, especially without "Offset Collision" conditions that Classic has. And I personally am not sure where to start with something like this, though I would really like to be able to create proper fluid dynamics, even if they're blocky fluids.
So, yeah. Any ideas? I imagine some of you smart fellows might take this request as a challenge, heh.
Edit: Hell, if any of you guys somehow take it one step further and do proper fluid dynamics like in that "Where's my water?" game on the iOS, that would be awesome as well. I'm really curious as to how those developers managed to pull it off. Probably asking a bit much, but, one can hope.