To make a homemade soda you need:
Plain Seltzer or Sparkling Water
A pinch of Salt
Agave, to taste
Grapefruit – or other fruit you enjoy
You don’t need a juicer for this, just a citrus juicer, which is pictured above – to efficiently release all the liquid.
Make your sweet fruit mixture first by mixing the grapefruit juice, salt, and agave together in a glass. Mix well. And then simply pour your bubbly water on top of it and add some ice.