A:AnswerYes you can easily use find my app on your iPhone and make a sound to find the one that you are missing. But if you had the AirPod with low battery and it dies then you will have to trace back your step and try to find it
A:AnswerIf it’s been less then a year, and no physical damage to it that you can see.... ;), Call Apple Support and they will replace it for you, if not you can call them and they will sell you the left one
A:AnswerWhen I first purchase mine I accidentally drop them in a cup of ice water I instantly retrieved them but they were a little laggy for a day or two. So I assume in a larger body of water they might not survive. Hope this helped
A:AnswerNope! These are 1st generation Airpods. I feel like there isn’t really a huge difference between first and second gen anyways. But, there ya go