tips for humidifying a terrarium

Hello.

A few months ago I acquired a 45x45x45 terrarium and I put various types of detritivorous arthropods in it (woodlice, leafworms, mealworms, cockroaches...) harvested in my garden (in Provence, in the south of France).

I was wondering if you would have any advice for me on its humidification (especially on the water spray).