Would I get a small container and put all of them in there and get a spoonful like every time I don’t know how many spoonfuls you put in there like a week or a month?You don't have to care for them in anyway as they live off of the damp substrate and eat all the mould and stuff like that so they don't need anything additional -
I can't specifically say how long they live for but they will die off once the substrate dries out but you will find a few in or around the water dish but that's normal