Can I use corn starch or baking powder instead of cream of tartar?

No; good question because this is a common misconception! Baking powder does have baking soda mixed in it, but it also has a powdered acid, such as cornstarch or cream...

Yes, as results tend to be better when you stir it before distilling, to make the mash work.

If you are making Snickerdoodles and realize you don't have any cream of tartar, that's okay! Use lemon juice, vinegar, or baking powder for an easy substitution.

Do not put baking soda, corn starch or any other household cooking ingredient on a burn. Instead, use cool water and antibiotic cream.

Baking soda is made of one ingredient that's ground up. Baking powder has other things added to it.