Interesting question there Xcidium...
The "Juice" as we know it in general was originally created by a group of tribes people on a tropical island.
Whilst the women of this tribe would stay at home all day washing and caring for the children the men would go off searching for fresh fruits. The men would come back to the tribe and give the women all the fruit they managed to find. The women would the stand over buckets, and put each piece of fruit between there huge tribe like thighs and squeeze untill all the liquid from the fruit came out.
So the juice you know as "Tropical Juice" is made up of different tropics' style fruit, just like it was when it was first created.