Do you prefer your water bottle to be made of metal, plastic, glass, or something else? Straw or no straw? How big would you want it? Should the bottle taper down in the bottom, or do you think the sided should stay vertical? Are any of you one of the few people who would like that weird rectangular bottle? Or maybe one of those squishy fold up ones for travel? No handle, flip up handle, mug style handle, or little loop?
Note that I am not affiliated with any water bottle company
Thick borosilicate-glass ( no plastic-chemicals getting into my water, thermal-shock-proof, thick-enough to not be too fragile ),
wide-mouth for easy-cleaning,
fits on bike bottle-holder ( plastic one, not metal, to protect the bottle ),
much taller than the short bike-bottles,
cover to keep grime off the drinking-from lid,
silicone or something seal(s),
able to drink quickly from it at stop-lights.
Probably acrylic for the lid-material, since it seems to be reasonably-robust & not too putting-weird-chemicals into my water.
( all this is because bike-bottles made of low-density poly-ethylene are absolutely vile with the chemicals they put into water, & poly-carbonate also has some chemical-seepage issues )
Actually, I’d want a package-deal: larger-diameter bottle-holder & bottle-to-fit: I want water, not svelte-traditional-bottle-diameter…
So, I was partly solving-the-wrong-problem at the beginning…
That’s how learning happens, though: ad-hoc…
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You don’t want to crash your bike someday and land on sharp broken shards/edges. Ask me how I know…