Jeremiah Kowalski

Jeremiah Kowalski is a drinkware product researcher and reviewer. He researches, tests, and analyzes drinkware products, with a primary focus on reusable water bottles, tumblers, and insulated drinkware. His work is dedicated to helping people choose safe, functional, and durable products for everyday hydration, based on real-world use and careful evaluation rather than marketing claims.He personally owns and has tested over 50 drinkware products, including bottles, tumblers, mugs, and filtration systems from brands such as Hydro Flask, Owala, Stanley, YETI, BruMate, and HydroJug.

Stanley Quencher 30 oz, Stanley IceFlow 30 oz, and Stanley ProTour 30 oz tumblers being cleaned in a sink

How to Clean Stanley Tumblers & Lids: Quencher, ProTour and IceFlow Guide

There are three main Stanley tumblers you’ll see most often right now: the Quencher, the ProTour, and the IceFlow. The cups themselves are pretty easy to clean. They have a similar sturdy build, and warm water, dish soap, and a bottle brush usually do the job. But the lids are where things get messy. A […]

How to Clean Stanley Tumblers & Lids: Quencher, ProTour and IceFlow Guide Read More »

Stanley and YETI reusable water bottles and tumblers lined up outdoors for comparison

Which Water Bottles Keep Drinks Cold & Hot the Longest? 46 Tested

You’ve probably noticed that almost every insulated bottle claims to have amazing temperature retention. The problem is that some brands don’t provide specific numbers, and even when they do, those claims aren’t always accurate in real-world use. That’s why I tested 46 insulated bottles I personally own and bought with my own money. This test

Which Water Bottles Keep Drinks Cold & Hot the Longest? 46 Tested Read More »

Person holding the Owala FreeSip Tumbler 30 oz by the side handle outdoors

I Tested the Owala FreeSip Tumbler for 30 Days: My Honest Review

The FreeSip Tumbler is one of Owala’s newer releases, and it brings over the clever FreeSip spout while fixing one of the biggest drawbacks of the classic FreeSip bottles: car use. This tumbler fits into car cup holders, thanks to its tapered bottom, while still giving you plenty of capacity. That alone makes it a

I Tested the Owala FreeSip Tumbler for 30 Days: My Honest Review Read More »

Jeremiah Kowalski drinking from the Piurify Flask hydrogen water bottle

Piurify Hydrogenator Flask Review: The Most Unique Hydrogen Water Bottle

The hydrogen water bottle market has become a bit repetitive. Most bottles look the same, work the same, and come with the same average performance, fragile borosilicate glass, and confusing instruction manuals full of odd wording. If you’ve had that experience and want something more premium, unique, and built to last, the Piurify Hydrogenator Flask

Piurify Hydrogenator Flask Review: The Most Unique Hydrogen Water Bottle Read More »