What can be used as a substitute for 7-up?

A substitute for 7-Up in recipes or cocktails could be a combination of carbonated water, lemon juice, and sugar. This mixture can provide a similar citrusy and bubbly flavor profile to 7-Up. Alternatively, you could use another lemon-lime soda such as Sprite or Sierra Mist as a substitute, though the taste may vary slightly. Adjust the proportions of the ingredients to match the desired level of sweetness and tartness in the final dish or drink.