Add the filtered water and non-dairy milk to a small saucepan and heat over medium low until almost boiling. Carefully transfer to a blender.
Add remaining ingredients to the blender. Place a dishtowel over the lid to protect your hand from the hot liquid and start blending at a low speed, gradually increasing to a high speed. Blend for about 30 - 45 seconds, or until mixture starts to look frothy.
Pour into your favorite coffee mug and enjoy.
*If you would like a stronger latte, add more yerba mate, 1 teaspoon at a time, during blending. Wisdom of the Ancients Instant Yerba Mate Royale is sweetened with stevia, so there is no need to add more sweetener when using this brand.