Whichever company makes the promotional bottles for Kershaw and Zero Tolerance. Currently using the 20 ounce ZT as my main water bottle at work. I do recommend it. No issues with it. (And yes, I do realize that the Kershaw branded one which is essentially the very same water bottle is $10.oo less expensive. So a better deal. I own both. The Kershaw is away in storage.)
My old water bottle for a handful of years used to be a Hydro Flask right around the same number of ounces. Pricey, but I figured it would last me at least a couple of decades.... Until it developed what looks like Black mold on the bottom of the inside. Noticed it one day when the purified water tasted a bit funny. Took a closer look, couldn't believe what I saw! Keep in mind, the ONLY liquid I ever put in that Hydro Flask was purified water over the years. So yeah, I'm done with that company. My ZT costs almost half as much and gets the very same job done; while also fitting in the side-pocket of my work-bag just like my old Hydro Flask. (Thought about getting some baking soda and using a bottle brush I already own to try and clean the Hydro Flask. But, I'm never going to be able to trust it again. So, I'm just going to chuck it.)
I refill my ZT with purified water from home, using a 46 ounce YETI water bottle as my ZT stays in my bag in my car. (I decided to see if YETI weighed in on the big controversy regarding their company. They did. Their explanation made sense. So, I bought one of their bottles.)