I've got some glass and transparent plastic cups with marks at deciliters up to 500 cc. They are commonly sold at stores here in Italy. I guess its the same all around the world. Or I just fill a glass with water and weight it, empty and full. 1 liter of water at usual temperatures and pressures is 1000 grams, a convenient choice. We don't need much more precision than that to cook. Even milk can be approximated with 1 l to 1000 g.