Make the raspberry simple ¾syrup by placing the water, sugar, and raspberries in a small pot over medium heat. When it comes to a boil, turn heat to low and simmer for 10 mins. Strain through a sieve over a bowl, pushing through to extract all the flavor. Set aside to cool completely.

To make the cocktail, place water, raspberry simple syrup, lime juice, and vodka in a shaker filled with ice.

Shake vigorously to combine.

Strain over a large glass filled ice.

Garnish with lime slices and raspberries (optional).

You can use sparkling water, club soda, seltzer, or even tonic water in place of still water - just remember to stir NOT shake!