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Indeed water is heavy. So get it to your home in the most efficient way - through pipes. I'm happy to do it just to avoid having to carry home everything I drink.

As soon as distributed rooftop solar takes off, I see a large industry in condensing drinking water directly out of the air with surplus energy.

https://github.com/openawg/openawg/tree/master/blueice

When I cycle somewhere, I fill up my bottle when I get there (or along the way). I know where all of the water fountains are on my regular cycling routes.

Likewise, when I go for a long walk or a hike, I carry a bottle along and fill it as needed.

If you find a bottle of water to be that great an encumbrance, then you were never really going to walk or cycle anywhere. There are plenty of good reasons to drive somewhere, but cupholders isn't one of them.