my first dripper i made was out of a red party cup with a pin hole, then i changed it to one of the large cups u get large super worms in and put a pinhole in it.
start with a tiny hole.
put water in it to see how it drips.
make the hole bigger till it get a drip every few seconds.
refill with water and place it on the cage. prefer above a plant.
clean it out every day or it will clog and get stuff growing in it.
or u can spend 10$ and get "the little dripper" from petco
it does the same thing but has a tube with it.
i had one but I didnt like it. could have just been The one i got but i know others who like them