The purpose of a fruit infuser water bottle is to make it easier to make fruit infused water. A bottle such as these helps you to be able to easily infuse your water with fruit on the go. There are all kinds of them out on the market and they make infusing your water with fruit really easy. You can put the fruit in a cylinder in the middle of the water bottle and fill the rest of the chamber up with water. After this the infusing is done for you.
This is a really nice solution for people that want to drink fruit infused water on the go. Shop around and figure out which of the many fruit infuser bottles that are on the market are the best for you.