Our cavalier drinks less than that per day, but she is fed raw and gets a lot of her water intake from the food. Kibble eaters will drink more water.
But unless Gracie gets really hard stools or shows signs of dehydration (sticky gums, skin losing elastricity, etc.) then I do not worry about it. She has always been more active at night and drinks more water after 4 pm anyway. With her, a little bit of crushed ice or adding a tiny bit of apple juice to her water has helped encourage more consumption.