This is a pretty interesting campaign, especially because, after taking a class all about water, I'm on the fence though leaning more towards tap water as my preferred drinking water.

Here is a campaign called We Want Tap, that asks you to take the challenge. You try five different bottles of water, one of which is tap, and if you can tell the difference then yay for you. Hahaha, I'm supposing most of the time you can't, providing evidence for the fact that since tap is carbon neutral, saves money, and reduces landfill usage that it is the way to go.

It even features a do it yourself bottled tap water kit for fun.