Put plenty of water in a larger cooler and hook up a 110v aerator with a stone on it to it to keep dissolved o2 in there. If it is cooler outside than inside, keep them outside, cooler temps reduce metabolism which reduces nitrogen wastes in the water that accumulate and messes up the water. If keeping longer than a few days I run down to the lake and grab a bucket of fresh water and add to it. If you are not near fresh water you can use tap, but you have do dechlorinate it or let it sit out a couple of days prior to adding. Keeping minnows alive a week sometimes longer is very doable.
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