Keep water fresh and the minnows will survive throughout the day. One of the main reasons for empty buckets is that many anglers tend to stay in a spot that is not producing. Maybe you caught one as soon as you got to the spot, or maybe it's just a comfortable place out of the wind. If you caught fish yesterday in 12 feet of water on a secondary point, that's where you should start fishing today. But, if the fish are not there or not biting, move on.
Many fishermen are hard-headed and try to make the crappie conform to what they want.
In all probability that won't happen. Fishermen would do better by adjusting to what the crappie wants. Afterall, If you want a crappie dinner, it's unlikely you would settle for a hot dog. One sure way to not catch fish is continue doing what has not been successful. It's especially true with the spot being fished.