There is a complete Surface modelling course available from Siemens. Lesson 87 covers building a water spout.
Go to https://docs.plm.automation.siemens.com/tdoc/se/108/help/#uid:index_xid618399:xid464417:xid489890 for the Surface Modelling Course
However I strongly recommend that you work your way through all the course material. Surface modelling is very different from solid modelling and takes some time to become proficient.
Can you post an image ?
Are you sure you need to use surfacing ? Solid modelling have some powerfull tools maybe you need surface just for a part of it.
I agree with trying to use solid modeling instead of surface modeling. I would follow the same steps as manufacturing a physical tap:
1. model a blank
2. helical cut or protrusion of threads
3. cut flutes
4. cut appropriate taper on tip depending on whether it's a starting tap, plug tap or bottoming tap.
Of course a sprial flute tap adds another "twist" to the process. Pardon the pun, it's Friday.