Blitz: Combine water and passion fruit pulp in a blender. Blitz for just a few seconds to loosen the pulp from the seeds (the longer you blend, the more the seeds will break up, which will require a more fine mesh sieve for the next step).
Strain: Pour juice through a wire mesh sieve to remove the seeds, collecting the juice in a spouted container.
Sweeten: Passion fruit can be sour, so add sugar to suit your taste.
Notes
The passion fruit pulp is simply everything inside of the fruit, seeds and juicy flesh included.