Here's how long a Coldest water bottle keeps things chilled compared to my go-to mug.

The universal push for better hydration has produced a seemingly endless supply of water bottles that promise to keep H2O cold for hours, days, even months. Admittedly, “months” is a stretch, but given recent advances in insulation technology, that milestone may not be far off.

Fresh off Stanley’s early-2020s hype, a new water bottle contender, Coldest, piqued my interest with its bold, brazen name alone. The company’s line of bottles and tumblers, which come in a range of sizes, styles and limited-edition designs, was featured on ABC’s “Shark Tank” and promises to keep beverages cold for 36 hours. 

Coldest also operates out of my hometown of Naples in Florida (which I didn’t realize until I researched it), and I welcome any opportunity to support a local small business. But did it ultimately live up to its hype, the thousands of positive reviews and the praise from national media outlets? 

For comparison, I grabbed my go-to $30 Owala water bottle and filled it with equal amounts of water (three cups) and ice (one cup). This model is a different size and shape than the 46-ounce Coldest, which means the liquid and ice were more condensed in the compartment.

That said, despite the lack of error-free, controlled-environment analysis, the primary goal was to determine whether the Coldest water bottle lived up to its 36-hour promise. 

After only a few hours, both water bottles delivered refreshing, ice-cold agua, with Owala consistently beating Coldest by a couple of degrees.

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