Back before I lost my pipes, I rehumidified overly dry tobacco by taking a clean glass quart size bell jar, adding a 1/4 of an ounce (or so) of quality sipping dark rum or whisky, closing the jar and shaking it until the liquid was equally deposited on all of the glass, dumping the excess, quickly adding the tobacco but no more than 1/2 full, sealing it up and shaking it every 30 minutes or so. I did this over the course of a few hours. If it was not feeling like it was moving in the right direction. I prepared a 2nd jar and transferred the tobacco and repeated the process. Once it felt "right", I left it for 24 hours, minimum. It always worked for me.
