In Haitian Creole, "kwi" refers to a tool made from the fruit of the kalbas tree (also known as a calabash tree). Specifically, the term describes the halved and hollowed-out fruit, which serves various practical purposes in Haitian life. It can be used for carrying water, as a bowl, or even as a makeshift sunshade. The kalbas tree is common in Haiti and is readily available to people, especially those in poorer communities. 
Here's a more detailed breakdown: 
Material:
The kwi is crafted from the hard shell of the calabash fruit.
Form:
It's typically made by cutting the calabash in half and removing the pulp and seeds, leaving a bowl-like shape.
Uses:
The kwi is incredibly versatile. It can be used for:
Carrying water: A practical way to transport water from rivers or other sources.
Drinking and bathing: Used as a cup or container for water.
A bowl: Serving as a dish for food or other items.
Sunshade: In some cases, it can be placed on the head to provide shade from the sun.