In this case, I'm showing you how to make a 'hydration station' for a Crested Gecko.
Since I'm working with smaller animals, I'm using a plastic shoe box that was given to me by a friend of mine - I've also used plastic tubs designed for storage, which can be used to accommodate larger animals.
As substrate, I've laid down a couple paper towels. Paper towels are an excellent substrate for hydration, as they hold quite a bit of moisture - they are also a great choice for juveniles of many species, as well as injured animals due to their cleanliness, ease of changing, and color (white, simple backgrounds are far easier to spot waste and other important to see items on).
I've misted heavily, and placed a food dish into the shoebox.
Using a paring knife, I poked several holes in the lid.
(Apologies for the angle, but it does show some of the holes better than a straight on view.)
Annnnnd... that's it.
Easy, huh? :)
Now, for a recovering animal, this is a pretty solid set up (add a water dish if they're going to be in there for more than a few hours, even with a heavy mist) - for an animal that just needs to be separated and is going to be in there for a prolonged period of time, use a larger space and add more decorations (paper towel and toilet paper tubes work well for a variety of species). Done and done. Quick, easy, and inexpensive.