I just bought a LARQ water bottle. It has a UV light in the cap that sterilizes the water.
Advantages being you dont ever get a bad smell inside your water bottle, you dont have to ever clean it (unless you put a sugary drink in it).
It also has what is called adventure mode which allows you to fill it with lake / river / stream water (so long as its free of sediment and murkyness) and it will disinfects the water.
The bottle is not cheap, starts @ $95 but can go up to ~$150 depending on size and single / double wall construction.
Has a micro USB charger with a battery that lasts 2 months in normal mode and 2 weeks in adventure mode.
I was never a water bottle person before but this has changed the way i drink water.
https://www.livelarq.com/