Grandma Shirl - Mom
Luckily I could pick up my phone and call my Mom who has the recipe for anything you want. Here it is and it dries clear also.
1 cup water
bring water to boil
in a cup mix cornstarch with a little water, enough to get it mixed
once water is boiling add cornstarch a little at a time until desired thickness
Now the thickness should be thicker than syrup but thinner than gravy! lol this is what Mom told me so I am passing that along to you as well.
There you have liquid starch. Mom said they used this all the time on clothes, etc where starch was needed.