I reaaaaally hate to admit this, I bought the bottle at Dick's (gasp!) had a gift card. You don't suppose Guyot are making crap to sell at the Wal-mart of outdoor stores, do you? This brings up another key issue-- I bought the bottle not only so I could ditch my Nalgene with steel cup, and that it would still fit various filters and purifiers designed to fit the standard wide mouth threads. Did they just make their product basically useless to me? Does anyone know anything about a change in manufacturing here? Also, not a defect,tried several others at the same chain again. Soooo it's either they're making two lines of product to sell or they've changed the product completely...
No, they're not making specific ones for specific stores. Still don't know what to tell you. I know a ton of people who use widemouth water purifiers on their Guyot's and they work fine.
Only person who could answer your questions are the Guyot family. Go to their site and send them an e-mail. I promise you they'll treat you well and probably send you some free stuff. If I recall one guy complained up a storm to them and the Guyots felt so bad they sent him one of every one of their products for free to apologize.
Personally if I were you...I'd get a Guyot Bottle directly from Guyot and see if it works best. I wouldn't be surprised if the ones that they're selling to Nalgene (Nalgenes SS bottles ARE Guyot Bottles) might be of a lesser quality control standard. I've only bought directly from Guyot.