The general instructions call for you to mix equal portions of mix, meat, and water in the NDF2 and similar instructions for AM/PM though veggies often have more moisture.
If find that if I mix that much water, the food looks like soup. Not all your dogs will want to eat soup. So I actually just eye ball warm water into the bowl and it more the consistency of oatmeal. It’s ok to do what your dog prefers.
Because your dog is taking in more water with his food, you may find that the volume of water he drinks from the bowl is reduced. Water is important to overall health, so be sure to keep a fresh bowl of water out daily and monitor any overall changes in water consumption, even if you find a new normal with this food.