There are a number of good ways... my favorite is to put some fresh, undried homegrown buds in with it for a day or so - or just some undried leaves will work. If you don't have that, then take a piece of fresh orange or lemon peel and seal it up with the weed. It does not take long and be careful not to get your dry bud too wet.
You can safely remoisten pot but it won't be as good as prior to overdying. Certain aromas and flavors will fade of change, though potency should be unneffected.
my favorite is corner a moiste teabag in one side of a ziplock and toss ur dry buds in there seal it and set in the dark for a while and it should be nice and moiste within half a day or so
yeah 200 ft is re dick u lous. i used to put a corner of a sponge in a little bag, pout it in the jar with the weed and like 4 hours later, take it out, and check the wetness of the bud, and leave the top of for a little or close it up