To be honest unless you drool like crazy normally( I didn't think so) then the water is mostly condensation. Hot breath + cold surface= water..
Chris..
No not an habitual drooler (unless there are ladies in the vicinity of course).

That would be condensation of hot, humid, spitty breath of course ;}
Not sure its all condensation though as I would have thought the mouthpiece would have warmed up a bit eventually and its worst by far when playing sop... when the water gets between rails and reed and affects the tone.
The "more head up position" idea does make some sense too as the curved sop neck naturally heads south sharply compared to alto and tenor and holding it up more horizontally does seem to help a little, just not enough, plus it looks a bit show-offy and gets somewhat tiring.
The quick fix is to run thumb firmly along reed from back to tip to expel the excess water on the rails but this doesn't last long.
I may work up to the sucking idea but just thinking about it is setting off my gag reflex at the moment!!
No jokes please!
Thanks for all the replies

Enough icons already.