substitue for cream of tarter

White vinegar will work as well.

If using cream of tartar for breaking down sugar crystals in sugary syrup, you can use a couple of teaspoons of lemon juice to do the job.

If using the cream of tartar for egg whites you can whisk in a copper bowl instead.

Cream of tartar is used to add volume to egg whites. Either leave it out or substitute 1 teaspoon baking powder for every 1/2 teaspoon of cream of tartar and every 1/4 teaspoon of baking soda.