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I recently got a large number of paints from my friend's mother who was deep into modeling back in her day, the paints she gave me where AD&D, i know that is Advanced Dungeons & Dragons but i don't know how to reconstitute the paint well. Some of them have a gell and then floating above the a think blob of the color stated, some are just dry. I added small amount of water to one and the paint seemed fine, though watery. But it only has seemed to work on that one i have tried it on 3 other ones.

Chuck out the dry ones, they're dead.

The 'separate layers' ones are probably fine, just need a good stir and a few drops of thinner, but I'd try them on some unimportant models or terrain first, just in case there's little lumps in the paint or siimilar problems.

The smaller size of glass marbles 5 drops of isopropyl alcohol and the appropriate thinner.
I use an ultrasonic cleaner with heat. In well sealed containers (like Vallejo and reaper) I use it to mix old paints. I also revived some water effects using the same method.