HetForHuman: They had those rock bowls that alot of people get for water dishes. And they had a big one on the bottom and then a smaller one covering half of it vertically. Then they had the bottom one filled with damp sphagnum and the geckos were all hiding comfortably in there and the top one was their water dish. It was really quite a nice site and it worked.
The only flaw I could see was that they may have to remoisturize it moreso than if you use a tuperware container