2 Persian cucumbers (or 1/2 English cucumber), thinly sliced into rounds, plus more slices for serving

12 ounces gin, such as Hendrick's

8 large ice cubes, or regular ice cubes

3 12-ounce bottles grapefruit soda, such as Spindrift

Place cucumbers in a small pitcher. Mash with a muddling tool or a wooden spoon until cucumbers release juices and break down into small pieces. Add gin, cover, and refrigerate at least 12 hours and up to 3 days.

Place ice in each serving glass. Pour 1 1/2 ounces cucumber-infused gin into each and top with soda. Stir once, garnish with cucumber slices, and serve immediately.