Heat water to about 120F, but don't let it boil because it can make the liquid congeal and become difficult to strain.
Add water and kava root to a regular blender and blend on high for 4 minutes. If you're using a high-speed blender, skip step number one. High-speed blenders are so powerful that they will heat up the water significantly as they work.
Pour the liquid through a muslin nut milk bag or mesh strainer that has been lined with cheesecloth, then drink up.