When I was a little girl, my dad loved grapefruits so much he bought special grapefruit spoons and knives that have edges to cut the grapefruit with. I developed a great love for grapefruit and during the month of April and May I try to have a grapefruit or its juice each day. I like to use bottled juice with this recipe because it gives a better, less strong flavor and doesn't cause explosions. If you do use fresh grapefruit juice, only ferment 2-5 days.