Ways for a 6th level character to keep their former foot around?

So, my character got mostly eaten by a remorhaz two sessions ago, and all the party was able to find of them was one their boots with a foot in it.

Assuming my (true resurrected through shenanigans) character wants to keep it as a macabre keepsake, what kind of options do they have for preventing it from rotting, with the resources of someone around 6th level (using 2024 rules)?

Most amusing answers welcome.