Found this at my local health food store:
1 liter coconut water
1 cup lime juice
Agave nectar to taste
Or
2-4 lemons (depending on the size)
1/8-1/4 Tbl flax or any really good cold pressed oil
a pinch of Celtic salt
a pear and or any fruit in season (have fun, be creative)
Stevia, maple syrup or raw honey
Peel the lemons and put in a blender with the oil, salt, and fruit. Add water to fill the blender, and also add Stevia, maple syrup or raw honey to taste. The mixture should be juicy and sweet to taste (add more sweetener until it tastes the way you want it to!)