When I was a little girl my dad loved grapefruits so much he bought special grapefruit spoons and knives that has edges to cut the grapefruits with. I developed a great love for grapefruits 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.