Prepare Jelly Mixture: In a pot, combine jelly powder, agar powder, salt, instant coconut milk, and coconut water. Stir well.
Cook Jelly Mixture: Heat the mixture over medium heat and bring to a boil while stirring continuously to prevent lumps.
Set Jelly: Pour the hot jelly mixture into a fairly deep mold or container. Let it cool and set completely.
Make Pandan Sugar Syrup: In a pot, combine granulated sugar, water, and pandan leaves. Bring to a boil until sugar dissolves and syrup thickens slightly.
Scrape Jelly: Once the jelly has set, scrape it using a coconut scraper or a regular spoon to create the kopior texture.
Assemble Drink: In a glass, layer ice cubes, 2-3 tablespoons of cocopandan syrup, nata de coco, scraped jelly, basil seeds, more ice cubes, 2-3 tablespoons of pandan sugar syrup, more jelly, and top with evaporated milk.
Serve: Serve immediately or prepare in advance without mixing ice cubes until ready to serve.