Two possibilities: (1) Get a plastic mess kit cup (0.8 oz.); they have measurement marks. (2) Put scratch marks on the inside of your pot at the one cup and two cup levels (put in a cup of water and have the pan on a level surface, make the scratches on two sides). For between one and two cups, you can approximate. Believe it or not, the only time you have to measure ingredients exactly when you're cooking is if you are baking cakes from scratch. Approximate works fine for nearly everything else.