The best way to moisten dry cannabis is with a humidity pack (I’ve gotten a sample of these and they are great https://bovedainc.com/store/). Adding water or moisture directly to cannabis encourages mold growth.
This article goes over this and provides some really helpful storage tips: https://www.hellomd.dev/health-wellness/59f9fc3be238d7000f440f5a/easy-tips-on-how-to-store-your-marijuana-the-right-way
Danielle Lim