Re: Proper Break-in Procedure with Opti 2?
it'll work fine. all my 12oz bottles have markings down the side, weird that yours doesn't. you could use a kitchen measuring cup, too, or anything that measures ounces, for that matter.
and, to be honest, the way i mix mine is approximately 2 ounces to approximately 2 gallons. i don't worry about accuracy, as long as it's close.