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
Whatever I have at hand is usually good enough. The lack of effort is it’s own advantage.
Currently I’ve got a 0.7L plastic slightly tapered without handle on my desk. Have a few of those that I got for free when buying protein powder in bulk.
Before that I had a standard 0.5L softdrink bottle i refilled instead of recycled. I don’t enjoy my water more despite the significant upgrade.