How many initial ventilations should be given during in-water rescue breathing?

During in-water rescue breathing, it is important to provide two initial ventilations to establish effective oxygenation for the victim. This approach is based on established guidelines which highlight the necessity of ensuring that the airway is clear and that air can effectively be delivered to the lungs. By delivering two ventilations, the lifeguard is able to quickly assess the effectiveness of the breaths provided and possibly prevent further hypoxia before any further actions are taken, such as exiting the water or starting chest compressions if necessary. This technique prioritizes rapid response in critical situations to maintain the victim's oxygen levels.