Sometimes, the simplest approach is the most satisfying.
Or, in this case, the most refreshing.
Put ice in a tall tumbler and add several slices of fresh lemon or lime. (Alternatively, you can also squeeze fresh dayap or kalamansi juice over the ice cubes.) Pour in a good measure of your cola of choice et laissez les bon temps rouler!
The tartness of the citrus adds a favorable tang to cut the sweetness of the cola, making this a most refreshing drink on a sweltering afternoon. 😉