01 - Combine water, granulated sugar, and sliced jalapeño in a small saucepan. Simmer gently over medium heat, stirring until the sugar has dissolved. Remove from heat and allow the jalapeño to steep for 10 minutes. Strain the mixture through a fine mesh strainer and let it cool completely.
02 - Moisten the rim of each glass with a lime wedge, then dip the rim into kosher salt or chili-lime salt. Set the glasses aside.
03 - Mix fresh lime juice, cranberry juice, orange juice, and the cooled spicy syrup in a large pitcher. Stir thoroughly to combine.
04 - Add ice cubes to each prepared glass, filling about halfway.
05 - Pour the mocktail blend over the ice, filling each glass about two-thirds full. Top off with sparkling water or club soda and stir gently.
06 - Garnish each glass with a lime wedge, several fresh cranberries, and an optional jalapeño slice.