Preheat oven at 350 F.
Sift flour, salt, baking powder and baking soda into bowl.
In a separate bowl, combine butter, sugar, vanilla, and eggs (one egg at a time) until mix is fluffy.
Fold in flour mixture. Do not over mix.
Evenly distribute the mixed batter into cupcake pan.
Place cupcake pan in oven and bake for 20 minutes.
Remove cupcakes and let cool for about 30 minutes.
Once cupcakes have cooled, inject each cake with about 2 ounces of the coquito drink.
*If you do not have an injector, a good alternative is to gently poke each cupcake with a fork (so as not to break up the cake) and then baste it with the coquito.
Allow cupcakes to sit in the fridge for at least an hour.