Place 2 cups of watermelon into a blender and blend until smooth.
Strain out the pulp, and place into the fridge until needed.
Grab your shaker, and add ice, your fresh watermelon juice, and your Ü Relax Mixed Berry packet. Shake until thoroughly mixed.
Take your lime and line the rim of your glass with it. Pour a small amount of salt onto a plate, and roll the rim of the glass along it until you have your desired amount of salt on the glass.
Add in ice, then pour the shaker contents into the glass.
Garnish with a lime wedge, or a slice of fresh watermelon, and enjoy!