This is a nicer version of the ubiquitous vodka redbull! You should hopefully be able to find Thai red bull (http://www.kratingdaeng.com/) in Asian food stores - there are also online stockists available.

It is the original energy drink that red bull was based on, and is 8 times more potent than the westernised version. I reckon it tastes much nicer and doesn't leave the same awful morning-aftertaste :)

Prepare a tall glass full of ice then add the Vodka, next add the Thai red bull (http://www.kratingdaeng.com/), next squeeze the lime into the glass before adding the skins. Finally, add the Soda water.

You could use lemonade instead of soda water for a slightly sweeter taste.