Jenny uses darts
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
Jenny initally set up a series of tubes solid metal poles to the glass, before moving the glass to the end of the just the tubes (presumably having realised that the poles were solid). After filling the glass once, Jenny then set up a water balloon over the top of the glass, and then popped it from a distance with a dart. She filled the glass from 3.8 metres away, receiving 4 points.
(Written by Taskmaster Wiki contributors)