You an get vermiculite at home depot or any garden center or feed store, with proper container and ventilation paper towel works fine though, it takes a cricket 6 weeks to reach full grown, that is there life span
That box is not sufficient for long term, the most successful method that has worked for me is using a decent sized plastic container with lid with cut out screen windows for proper ventilation, and as others have mentioned, keeping it clean with fresh food and either paper towels lined at the...
make sure your container has plenty of ventilation, cut out the sides and hot glue metal screen. Don't use fiberglass mesh they can eat through that, also lining the bottom with paper towel helps absorb some moisture, and they eat a lot so be ready to order more soon :D