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Water absolutely has a taste and a number of color gradients. We do not drink pure H2O. This is actually necessary for our survival.
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observer bias has entered the chat
It's much more likely that our sensory perception involved to be able to 'see through' the EM/light and chemical shape/taste properties of the medium we lived in and frequently interact with. >

I can’t believe we evolved a 24h sleep-wake cycle that just happens to line up with the 24h day-night cycle of our planet. >

It's the opposite. Color and taste are our perceptions of things, not the properties of an object.
For instance with eyes, life evolved in water so i wouldnt make sense for the medium in which it operates to be percieved opaque or have a color. We pierceve the so called visible spectrum on light but it's not hard to imagine an organism existing that sees different wavelenght of life and for some of those wavelenght water would be opaque. If fact we can already make cameras that see like that. >

Colour and taste might be our perception but they're also an estimation of the contents of the liquid. Taste and colour change with mineral and impurity content which can be measured using any number of instruments. >

To which, treating water as largely 'neutral' that we can ignore and focusing on impurities completely makes sense for sensory information.
What portion of what we're consuming is water doesn't really matter. The impurities in the water can be the difference between life and death. >

Indeed as I said earlier in the thread pure water tastes like your tastebuds being clean, there is no taste receptor for water though there are chemoreceptors that sense it being ingested >

Drinking water has a taste. They put minerals, and what not in it. If you want to experience tastelessness drink distilled water. It's rather unappealing. >

Isn’t it dangerous because of the sodium balance of your cells? Cells in contact with the water swell and die? >

Not healthy but nothing as drastic as that.
It just doesn't contain usefull minerals that but it will not actively harm you. Replacing your water intake with distilled water is not something you should do, but if you drank some all you'd feel is a bad taste.
Also as soon the distilled water reaches your stomach it mixes with it's content and stops being pure. 
If you took a cell culture from a lab and then put them in distilled water some might die due to the hypotonic enviroment, i guess that's where people get the idea.