M.L.
i have added tiny bits of warm water to it. it makes it a little slimy at first until it gets worked in, so you might want to put it in a ziploc and add the water and smoosh it in the bag. like no more than a table spoon of water at a time. it won't get it back to completely like new but it will satisfy a kid that needs something right now until you can get to the store and replace it with fresh.
or cook up a new batch of homemade playdouh with flour and cream of tarter, just google and you can find lots of recipies
Updated
i have added tiny bits of warm water to it. it makes it a little slimy at first until it gets worked in, so you might want to put it in a ziploc and add the water and smoosh it in the bag. like no more than a table spoon of water at a time. it won't get it back to completely like new but it will satisfy a kid that needs something right now until you can get to the store and replace it with fresh.
or cook up a new batch of homemade playdouh with flour and cream of tarter, just google and you can find lots of recipies