If you change the water a couple times after putting them in a bucket they will last a couple days if you keep them cool the frozen bottle works well but you have to have a small bottle in a bucket so it can float on top and not hit the shiners and not get the water to cold. In a live well hot surface water pumped in tends to kill them quick in my experiences. In the past I always kept them in a bucket but the water needs to be cool not cold are they die when they hit the water just like pumping surface water in the live well.