How to make your own aluminum-free baking powder

This is certainly not my own recipe, but I thought you might all be interested in knowing that you can make your own baking powder for cheap without the aluminum ingredient and taste. (http://www.europeancuisines.com/how-to-make-your-own-aluminum-free-aluminium-free-baking-powder-from-scratch) To make the one teaspoon of commercial baking powder, mix together: 1/2 teaspoon cream of tartar 1/4 teaspoon baking soda 1/4 teaspoon cornstarch I plan on making this in bigger quantities and then will refill my baking powder cantainer.