In the bowl of a stand mixer or a large bowl using a hand mixer, beat the butter on medium speed until creamy. Stop the mixer.
Add the oil, water and sea salt. Turn the mixer on low speed to reduce splashing, and begin mixing. As the water and oil begin to combine with the butter, increase the speed. Continue mixing until the butter has absorbed all of the water and oil.
Pour the mixture into a bowl and cover with a lid. Place it into the fridge or freezer to firm up. Once the spread has solidified, store the spread in the refrigerator.