Buy them at the bait store, 10 bucks worth is enough for 3 people for the day.
Take a i gallon zip-lock baggie into the bait shop, put the minnows in the bag. Seal the air out of the bag and put them in a small lunch size insulated cooler packed in ice. Once on the water I get enough out of the bag and put in a small container. Only get out enough for 10-15 minutes or so. Keeps some ice in the little container if its warm out, then dump out the water as it gets warm.
No aereator, no 6 gallon bucket, no minnow net, no batteries, the minnows die too fast most days anyway. This has become my way most days the last 4-5 years. They are easy to handle, not flopping around. Just keep them good and cold when you put them on the hook.