You will need 2 pint-size (16-ounce) wide-mouth mason jars with lids. Remove the lids and set them aside.
Prepare the pineapple spears by cutting off the top and bottom of the golden pineapple.
Next, you will stand the whole pineapple up and carefully slice off all the outer skin of the pineapple. You will want to make sure to remove any seeds or tough parts.
Slice down the middle of the pineapple, vertically, so that you have two long halves and then again so that you have a total of four pineapple sections.
Remove the tough core part from each of the pieces.
From this point, you will make thinner slices of the peeled and cored pineapple. This should yield 12 to 14 spears.
Place half (about 6 to 7) of the spears vertically into each of the wide-mouth mason jars. If your spears are too tall for the jars, then you can just trim off a small piece of each spear so that the lid will be able to close on the jar.
In a measuring cup with a pour spout, add the Malibu Rum and coconut water. Stir to combine.
Divide the liquid evenly between the two mason jars of pineapple spears and seal them with the lids.
Refrigerate for at least 4 hours but no longer than 24 hours.
You can use these pineapple spears to garnish your favorite tropical cocktail glass or just eat them straight from the jar as a fun boozy treat.
If you do not want spears you can just dice your fresh pineapple into larger chunks and follow the instructions from steps 7 to 10. You can then place the pineapple chunks onto cute cocktail spears with a maraschino cherry as an alternate garnish option.