I don't believe water damage is covered under RMA/Warrenty so you're potentially looking at an insurance job here.
As @Bruce states, reach out to your Meraki AM or Partner and see if they can help with load equipment.
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.