Linda, I hope you found your humidity papers. I know exacly what you are talking about because I have a Brinsea as well. If you didn't find them, I still think you could use folded up paper towels to do the trick. The water just needs something to catch it and spread the water out so that it evaporates.
I am trying the dry hatch with the styrobator. I have not put any water in the channels at all and mine has a fan. Reading Renee's cheat sheet, I am not sure if I am supposed to add water now to try to keep a little moisture in there or if I am supposed to wait until lockdown? Anyone else doing this method with a forced air incubator?