1-2 cucumbers
1 large apple
1 lime
Juice the cucumber and apple in a juicer (buy here)
Freshly squeeze your lime with a manual juicer {(where to buy)|http://amzn.to/1fpCR1X] and mix with the cucumber apple juice.
You can juice your lime if you like in the juicer.
Add more cucumber or apples depending on how sweet you would like your juice.
I bet some fresh ginger would spice this juice up nicely.