That's right, if you look close, it has grapefruit, orange, lemon, and lime!
I used about this much fruit. If you don't want to count it was:
1 orange (would have used more if I had them)
I juiced out all the juice and pulp I could get out of the fruit into a pitcher. I also added a little bit of fresh lemon and lime zest from the leftover rinds.
Then I added almost a cup of sugar (YIKES!) I do this a little at a time so I can taste test as I go.
Then I filled the pitcher with lots of ice and water. (I added the ice so it would be cold right away).