Yes, you can definitely use broth/stock - vegetable or any meat stock will work. Stock will enhance flavor, just make sure to adjust the amount of salt added to the rice, even if your broth is low sodium. It's better to add a little more salt and/or spices later than to oversalt. You can also combine water and stock - for example use 2 cups of water and 1.5 cups of broth, and again, adjust the amount of salt used.