I want to include more of the water.
Are the images that contain water calibrated? Can you see them in the rayCloud view? Did you add a processing area?
Note that if the images that contain only water do not get calibrated, they do not contribute at all to the processing and can not be used to give color to the orthomosaic.
Images that capture only water, cannot be calibrated (optimize internal and external orientation of the camera). The reason is that it is very hard to find keypoints on water surfaces (water is very uniform). Even if keypoints are found, it is very hard to match them between images, as these points are not static (water moves).
It is suggested to take images that contain water with some land (30% of land minimum). In this case, the images could get calibrated and contribute to the orthomosaic generation. For more information about how to map water surfaces: 202557459.