I just added some water to mine and stirred it up. I didn't add enough to make the whole pot useable again; I figured it'd dry out again before I could use it all. I just added water and stirred until I had enough to use on my project.
Rebecca, you have to by a re-inker for that. I do believe the little bottles are like 5 bucks? Im not sure how many times the bottle gives you. I have never experianced a good ink pad go dry yet :X *Knock on wood*
Re-inker for the pads. One bottle of ink will last for the rest of life of your pad, unless you use it so much you wear out the pad. I still have the same re-inkers I bought when the pads came out, and have used the ink for more things without the pad, than with. I still have more than half in every bottle.