Substitutes:

• Soju: If you don't have Soju, you can use vodka as an alternative. It changes the flavor slightly but still works well in this cocktail.
• Blue curaçao: Triple sec with a few drops of blue food coloring can replace Blue curaçao if needed. It keeps the citrus flavor intact.
• Lemon-lime Soda: You can use club soda with a splash of lime juice and simple syrup if you prefer a less sweet option.

Making it Non-Alcoholic:

• Soju Substitute: Use a non-alcoholic spirit that mimics Soju's flavor profile. These are available and do an excellent job of replicating the taste.
• Blue curaçao Substitute: Opt for a non-alcoholic blue syrup or make a simple syrup infused with orange peel and blue food coloring.
• Proceed As Usual: Use these non-alcoholic substitutes instead of the regular ingredients, follow the original steps, and enjoy a non-alcoholic version.

Making it Vegan:

• Check Ingredients: Ensure that all your ingredients are vegan-friendly. Most commercial Sojus are vegan, but always check labels to be sure.
• Vegan Lemon-lime Soda: Use a vegan-certified lemon-lime soda to ensure no animal-derived ingredients are present.
• Proceed As Usual: Follow the original steps using these vegan-friendly ingredients to enjoy a vegan version of Soju Blue.