How can I cook steak in a bag in water?

To cook steak in a bag in water, you can use a method called sous vide. Simply season the steak, place it in a vacuum-sealed bag, and submerge it in a pot of water heated to a specific temperature using a sous vide machine. Cook the steak for a set amount of time, then sear it in a hot pan for a crispy exterior. This method results in a perfectly cooked steak with consistent doneness throughout.