In glass filled with ice, combine gin, lemon juice, simple syrup and soda. Mix gently and serve.
Tip: To make strawberry soda water, combine ripe sliced strawberries with soda water in sealable container. Let marinate for at least 30 minutes. The berries will take on the fizz of the soda and the soda will take on a light blush colour and strawberry aroma. Spoon berries over desserts or salads!