You know, sailors used to get scurvy because of C deficiency back a couple centuries ago. Vitamin C degrades really easily, but is there any way you can store it long term other than pills or tablets? I’m just wondering if it would have been possible to do this in the past with the technology that was available.
The issue with recreating that environment on a wooden boat is that the sea is really, really wet. Sailing boats definitely had issues with spoiling citrus fruit, it’s part of why the british navy switched to citrus syrup at one point.