A:AnswerYes you can, i do it all the time. But after be sure you shake them or pat dry because little excess water may cause others not to be able to hear you on the phone.
A:AnswerEveryone’s ear canal is different I purchased the 3rd generation but have to return them because they constantly fall out. The second generation AirPods fit perfectly
A:AnswerYes! as long as you have an active warranty you can contact Apple Support for a case replacement and only pay the difference if you don't have Apple Care+. Hope this helps <3