Have a recipe that calls for self rising flour and you don't have it?
In a one cup measure put 1 1/2 tsp baking powder and 1/2 tsp salt. Add flour and level off with a knife.
Don't have any cornstarch? Use half as much flour as a recipe calls for cornstarch.
Dont know how to thicken with cornstarch? It's easy. In a coffee cup place desired amount of cornstarch in cup (I just spoon it in- You can use more then neccesary and discard the rest later) Add Cold water and stir till creamy and no lumps. Add to liquid you want thickened and stir constantly till thickened on LOW heat. Add more cornstarch paste until desired cooking after each addition on low heat.