Tequila-Watermelon Refresco

In Mexico, a freshener is usually called a very sweet soda in bottles. Take the concept of a refreshing carbonated drink to a tastier place with this high cooling watermelon smoothie - a less sweet soda with a pleasant taste.
Put the watermelon in a blender; whisk until smooth. Pour the watermelon puree through a sieve into a large bowl, pressing down with the back of a spoon to extract as much liquid as possible; remove any solid particles. Combine 3 cups watermelon juice, tequila, Triple Sec, lime juice, and salt in a jug; whisk to combine. Carefully add the soda. Serve with ice and lime wedges.