If you have a 10 gallon tank, put the mice in there with aspen and torn up newspaper to nest with. Ask for all females if you can (will smell less and reduce fighting). Since you hopefully will only keep them for a week or two, pick up some mouse food from the pet store. I feed mice and rats, Becky's rat mix in the feeder forum (sticky).

Make sure they always have food and fresh water and clean the tank once a week.