Don't do it. Seriously, don't do it.
Kiwi in your water bottle is a bad idea.
Here's why:
1. They'll make your water taste like a bad idea.
2. It's like trying to put a kitten in a blender.
3. Who needs that kind of existential dread?
Read more about the kiwi debacle Disclaimer: Don't try this at home Kiwi in the wild: a cautionary tale