Take an electric blender and one by one pour all the ingredients in the jug. If you do not have a blender, then a cocktail shaker can also do the job. But make sure you use half of the ingredients, or else they will not blend properly and might spill out of the shaker.
Depending upon your choice, you can either pour the drink in a jug and allow the guests to have Bananarita Cocktail according to their requirement, or directly pour the drink in beautiful cocktail glasses and garnish them with pineapple or banana slices. You can also add a few chunks of pineapple in each glass in order to make the drink more fresh and lively.