Tap plus reusable water bottle. It's free.

Filtered fish Urin aka tap water.

Deer Park, tastes the best although I'm not sure it's as good as it once was.

I like bubbly water but I'll drink anything that's not Dasani.

I know french doors with water / ice dispensers are way more prone to breaking than ones that don't route water through the door, but man, I love mine. Having filtered water easy to access makes me so much more likely to actually drink water regularly.