Reusable water bottle

Hi, do we need to buy new reusable water bottles for pesach? We have plastic or metal insulated reusable water bottles that are solely used for cold water. Thanks and chag sameach!

Hand mixer for pesach

Is it possible to use a hand mixer that is used throughout the year on pesach if I kasher the attachments which are full metal? The handle of course is not able to be kashered.