RARE has the most impressive water technology any video game, Sea of Thieves is a very unique title. RARE is a first party studio by Microsoft, I’m pretty certain they can allow you to borrow the code they have.
Being able to have depth to the water, rough waters due to weather or hurricanes and just the smaller details like adding in functional waterfalls when you fly close to them.
Note: If this amount of detail is too intensive for lower end computers, just have this feature for people who play on High to Ultra settings.