Any thoughts on using a fruit fly container with medium and placing it into the vivarium directly and poking a small hole on top so some fruit flies can gradually leave the container and into the vivarium for the hungry frogs.

I actually did this over a 4 day trip where I didn't have any one to help with the frogs. I would imagine you might be able to do this for even a week trip but of course there would not be any dusting with calcium or vitamins.