I've heard of two methods though I've never tried either one.
First method: Spread some tobacco out on a plate thentake a damp (not dripping) paper towel and cover it. Leave it as long as it takes to regain the proper moisture content, redampening the paper towel as needed.
Second method: in a large tupperware container put a small plate of tobacco on one side and a damp towel on the other. put the lid on the tupperware. check once or twice a day until the tobacco is moistened properly.
YMMV
Good luck and congrats on the smoking lounge! Think of the BOTLs outside shivering and count your blessings, LOL!