as the roll starts, the nose will start to drop
pick the nose up with some rudder. rudder use will be opposite to the stick deflection so you need to think about the secondary effects of yaw (from stick) and roll (from rudder).
the glass of water has long gone by this stage.
keep the roll going. less rudder is needed as you go inverted but you now need to push forward on the stick to keep straight and level.
still keeping the roll going, you will start to need some rudder again to pick the nose up, but this time the secondary effects of yaw and roll will be acting together in a different way from when the controls were crossed.
you having a good teacher, perhaps he can advise you on this?
and BTW, having a good teacher doesn't make you a good student.
I could have been taught by John Taylor or Andy Cubin, doesn't mean I'll ever be as good as them.
In neither scenario does the glass of water remain intact.
I think you're a bluffer Knox............
Only a student - so be gentle - that sounds like a slow roll to me...not an aileron roll......
