Does water go off?Watch
If you drank out of the bottle you introduce bacteria to it and that can cause the water to go "off". Also, the plastic starts to leach into the water at some point which also changes the taste.
No worries each To Their Own, which brands have you tried also have you tried mixing it with squash?
May the 4th be with you
Also sparking water is ok if you are making MOJITO!!! It's good for mixing drinks just not by itself 💯