However when I do the steps listed in that my map won't fully compile and I get a leak.
If I delete the aforementioned blocks created and re-compile... there is no leak. So for some reason even though all edges of this block are within my original construction it leaks...

Is there another way to do it in Portal 2?

All I do is place a block, make all sides nodraw and use the texture underground_water on the top.

I just noticed it turns the block into an entity of trigger_waterydeath...

Might just wait for official SDK release and if I get errors from there figure it out.

Maygus wrote:
Nah, I took that out as part of the setup instructions I followed on modDB as the guide on here didn't work for me... only made hammer crash.

Either way - I'll wait for the official SDK. Getting weird lag errors, yet if I load up Portal 1 / Left 4 Dead 2 SDK setups ... it all runs smooth as silk.

That is how I've done mine... that's a more concise version than the modDB setup... (and better than the one I found posted on these forums).