For me, the waters were... well, pretty watery. Slippery in a way that discharge wasn't. Especially at first, it was kinda cloudy white (mixing with the CM, I think), but clear later on. Oh! And it really did have this strange, slightly sweet smell- different than CM smell, anyhow.
I'm sure that doesn't help much...

It wouldn't have for me, when it was me wondering. Um, one thing you can do if you talk to your mw/ob is that the pH is different, and can be tested. But short of that...
Julia