Step 1

Using a blender or juicer, puree watermelon and cucumber together. Strain using a fine mesh sieve if using a blender to remove pulp and set juice aside (preferably in fridge to chill).

Step 2

Juice limes, then muddle with mint using a wooden spoon or a muddler if you have one. Put the mixture in a shaker with ice and shake for 15-20 seconds. Strain into a large pitcher.

Step 3

Add juice to large pitcher, then vodka and bottle of sparkling water.

Step 4

Pour into glasses filled with ice and enjoy!