FAQ: Montii, FAQ: Montii Bottle & Cup Can I heat my MontiiCo bottle or cup on a stove or microwave? Heating an MontiiCo bottle or cup is not advised, will damage the painted finish and bottle, and voids the warranty. Microwaving metal is extremely dangerous and should never be tried. overscan Can I fill my MontiiCo bottle or cup with acidic drinks such as orange or apple juice? Are the MontiiCo bottle lids interchangeable?