My wife bought me a barista course around a year ago which was very enlightening. One of the topics the teacher raised was using the right water so that the flavours in your coffee shine.
At the time I thought this was very interesting but soon afterwards I forgot about it - that was until the other day...
I decided to try the Lean Caffeine Nicaragua with 2 different waters - Glaceau Smartwater and Volvic. Wow what a difference this made. My favourite was the Glaceau Smartwater (which is basically tap water which has been distilled and then electrolytes added back). The coffee was noticeably better than before!
So if you want to elevate your coffee try Volvic, Glaceau Smartwater, and Evian and let me know via email if you noticed a difference. I'm assuming this will also work for tea.