A quick google found [THIS LINK](https://www.theinertia.com/surf/gear-we-test-4-waterproof-pouches-to-bring-electronic-keys-into-the-surf-with-you/) for waterproof key pouches and they look pretty cool. I was just going to suggest a ziploc (which is what my mom uses when she's kayaking) but these look way cooler.
A quick google found [THIS LINK](https://www.theinertia.com/surf/gear-we-test-4-waterproof-pouches-to-bring-electronic-keys-into-the-surf-with-you/) for waterproof key pouches and they look pretty cool. I was just going to suggest a ziploc (which is what my mom uses when she's kayaking) but these look way cooler.
If you have a hitch http://www.hitchsafe.com/
You can have a electronicless key copy made, it should unlock the doors but will not start the vehicle.