It certainly doesn't do you any harm. I went through a transitionary phase where for several months I prepped using 2/3 water and 1/3 coconut milk, as it helped with the taste so I could drink it. After a while it was no longer necessary and then after that I started liking the taste of kava so I prefer not having anything mess with it. But if you like it with milk or nut milk or whatever, by all means, enjoy it the way you like. Is it required? No, not at all.