I can't believe I was Walking dead with Brita for sooo long. ZeroWater is great and I just gotta mention the added benefits. 
1. I take partially frozen water to work and with Zero even when all the ice melts, it still is cool going down. It's magical!!!
2. I found that my frozen ice lasts way longer than before. It's something scientific, but I ain't complaining.
3. I love that it's tasteless, odorless and when I have dry mouth it quenches my thirst but good!