How do u keep the humidity in a homemade Styrofoam incubator?

Question

i have tried a bowl of water and a fan, what else can i do

Answer 1

A homemade styrofoam incubator is sort of sloppy, if you don't mind my saying so.  A well-built, mechanical incubator will maintain a much more accurate humidity level.  Don't forget that the humidity level is slightly different for different species, so putting a bowl of water in won't do a whole lot of good.