Draw A Spline to Drive liquid flow
Next we will draw a spline to drive the pathway of the liquid simulation. This spline will act as the path the simulation will follow. Use the Pen (Create>spline>pen) to create the spline. Using the top, side and front views to help us we can draw a spring shape that flows from the bottom to the top. The last part of the spline must finish inside the glass so that the liquid simulation fills the glass.