Well Solani tobacco I find is normally on the dry side, and if its perfectly dry for smoking, I would just put it in a mason jar and leave it. If its too dry, I would mason it up and toss in a humidity disc soaked in fresh distilled water. You can buy those disc at the majore online retailers - they are pretty cheap and I have found that they work quite well. You want to be careful about adding too much moisture, because that's how you get mould.