Traditionally, yes, risotto is made with dry white wine. It adds quite a bit to the overall flavor of risotto and adds a bit of acidity. Choose a dry white wine that you enjoy drinking. Most of the alcohol in the wine will cook out, leaving a hint of the flavor. However, if you would rather not use it, just substitute with an equal amount of stock or broth. You can also add a squeeze of lemon juice to the broth to add some acidity. You can also get a tablespoon or two of less sweet grape juice to bring some more flavor.