Self-rising flour is a type of flour that is combined with baking powder and salt, allowing baked goods to rise without the need for yeast. If you're unable to find self-rising flour at your local grocery store, there are a few potential substitutes. One option is to mix all-purpose flour with baking powder and salt in a 1:1:1/4 ratio to mimic self-rising flour's composition. Another potential substitute is cake flour, which is lighter than all-purpose flour and has a lower protein content. However, cake flour may produce a less fluffy end result. Finally, you could use biscuit mix, pre-made flour blends that include baking powder and salt, or simply use yeast instead.