What are some creative ways to combine seltzer and espresso for a refreshing and energizing beverage?

One creative way to combine seltzer and espresso is to make an espresso tonic. Simply pour a shot of espresso over ice and top it off with seltzer water for a bubbly and refreshing drink. Another idea is to create a coffee soda by mixing espresso with flavored syrup and seltzer water. These combinations can provide a unique and energizing twist to your usual coffee routine.