Hermione manages to stay unnoticed for two more meals, without any more visits from Malfoy – there is not enough water with the meals for her and the few other prisoners in her cell, though, and she finds herself very thankful that Malfoy had come down. If he hadn't given her that water, then either she would be near death now, or she would have had to withhold the water from the other women. She is so very glad that she didn't have to make that choice. They may be mercifully insensible to what goes on around them, but Hermione can't bring herself to withhold food and water from them.