I have been out of the bottle buying business for awhile, but I brought the nipple we used to stores and tried them there on glass bottles. I don't think there was a ton of ss bottles then
I bought born free plastic at whole foods, five years+ ago. Do u have whole foods? You could call to see if they have the ss. bought born free stainless steel at babies r us. Not sure if they still carry at babies r us.
Do u have REI, the sporting goods store? They sell some keen lantern. U can buy from them, ship it to the store, they call you, you open package, if u don't like u return it right then and there. No shipping cost
Call kleen kanteen. They should know something about compatibility if kleen kanteen wants to
promote themselves in the baby world. Same thing with born free products