This article will guide you on starching a shirt with cold water starch which you won't find difficult to get, especially for those living in the city.
We will you cold water starch for this purpose.
Steps :
1. Pour 1 cup of cold water in a bowl.
2. Stir continuously while adding starch (a spoonful).
3. Continue to stir till it completely dissolves
4. Dip shirt fully in. Leave for 5mins to absorb.
5. Remove shirt and spread out in the sun. Don't squeeze out water from the
shirt. Hang it like that.
You'll love the stiffness of your shirt. Repeat the process for other fabrics that require starching.
One thing is to starch and another is knowing the best and easy way to... http://theprolaundry..com/2018/09/how-to-starch-shirt-with-cold-water.html

native starch is d best

Local, you mean?