Question: how much water for 2 cups of macaroni?
Answer: Since I usually only cook about 1 to 1.5 cups of dry pasta (around 100g to 150g) for bentos, that's the amount I started with. I put 1 cup of macaroni into a fairly small saucepan, added about 2 cups of cold water (just enough to cover completely) plus about a teaspoon of salt, and started cooking at high heat.