I rehydrate my Boveda packs but I don't allow them to come in direct contact with something wet. I rehydrate them by exposing them to a higher rh.
I take two glass dishes where the smaller one can sit inside the larger and where the larger has a tight fitting lid.
I use glad Lock n Lock containers. Something like this.
https://www.amazon.ca/Lock-Starfrit...TF8&qid=1515887157&sr=1-4&keywords=glass+lock
Place a little bit of water into the large dish. Place the small dish inside the large one. So now you have a little moat around the small dish. Place your dry gritty spent Boveda in the small dish and put the large lid on the works. Let that set-up rest for a few days and check your Boveda packs. When they are dehydrated and supple again, remove them from the dishes and store them in the zip lock package they came in.
If you over hydrate them by leaving them in the containers for too long they get over bloated and don't work as well.