Squeeze or mash the soursop pulp to extract the juice.
Strain to separate the juice from the soursop pulp.
Add the lime juice and sweeten to taste.
Notes
The amount of water this recipe uses is just enough to make a rich, slightly thick soursop drink. If you water thinker juice, use a bit more water.
The teaspoon of lime juice only gives the drink a hint of lime taste. I wouldn't say I like the lime overpowering the soursop. If you'd like more lime flavour add a bit more juice.
You may want to add a bit more sugar if you like your drink sweet.