Code:
new ent;
while((ent = find_ent_by_class(ent,"func_water")) != 0) // forgot if it's func water or not
{
set_rendering(whatever);
}
If it's not that, then I think it's just a func_wall with solid turned off on it. You could cycle through all ents and if a keyval is solid 0, and some other stuff that's water specific, render it.
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