It is easy to make a bunch of these ahead of time and save them for later use.

2 cups flour
1/2 tsp. salt
1/2 tsp. baking powder
1/4 cup vegetable shortening
3/4 cup water, warm

Mix together the flour, salt, and baking powder. Cut in the shortening until the mixture has a mealy appearance. Slowly add the water while mixing. Form the dough into a ball. Place the ball on a floured board and knead until firm (about 2 minutes). Divide into 12 small balls.
Cover and allow to rest for 30 minutes. Roll each ball into a thin 7 inch tortilla. Heat a heavy skillet. Cook the tortilla for 1 minute per side. Wrap in a damp towel. Serve immediately.