Put watermelon chunks in blender and blend until smooth. Strain watermelon juice. You may have to do this in a few batches.
Put watermelon juice, lime juice and Daily Energy Booster Powder in blender and blend just until combined. Pour into ice cream maker (follow manufacturer's instructions on how to prepare your ice cream maker for use) and let ice cream maker run for about 20 minutes until mixture reaches slushie consistency.