I'm out of baking powder, can i use something else???????????????????!

I'm out of baking powder, can i use something else???????????????????

Help ASAP

For each 1 teaspoon baking powder called for in a recipe, use:

1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar;

OR

1/4 teaspoon baking soda plus 1/2 cup buttermilk, sour cream or yogurt (to replace 1/2 cup liquid called for in recipe).