For the Cherry Simple Syrup:

1. Place the cherries, sugar, and water in a small saucepan and bring to a simmer.
2. Using a potato masher, mash the cherries and continue to simmer for another 5 minutes.
3. Remove from the heat and let steep for 10-15 minutes.
4. Strain and discard the solids.

For the Cherry Lime Rickey:

1. Place the cherries and lime juice in a cocktail shaker and muddle the cherries until they are completely broken up and release their juices.
2. Add in the bitters, simple syrup, and gin.
3. Strain into 2 Collins glasses filled with ice and top with club soda.
4. Store extra simple syrup in a glass jar in your refrigerator for up to 1 week.