Polynesian Watermelon Drink ( Otai)

1 seedless watermelon, halved and sliced

3 cups water

1 (15.25 ounce) can crushed pineapple

1 (12 fluid ounce) can evaporated milk

½ cup shredded coconut

2 tablespoons white sugar, or to taste

½ lime, juiced

Grate watermelon with a fork from the rind into a large bowl, leaving no large chunks. Stir water, pineapple, evaporated milk, and coconut into the grated watermelon. Add sugar; stir until dissolved. Squeeze lime juice into the watermelon mixture.