You can use lemon or lime juice as a 1 to 1 replacement for vinegar in egg dye recipes.
For example, if the recipe calls for 1 teaspoon (4.9 mL) of vinegar, use 1 teaspoon (4.9 mL) of lemon or lime juice.
You can use fresh or bottled lemon or lime juice. Both will work the same way.
Hope this helps :))