This is goldWater needs to be in sealed containers! I have moved quite a few tanks & livestock and one of my early moves i thought i could leave a little water in the tank. I still cant believe how much water movement happens in a tank while driving. I use water jugs of various sizes filled with very warm water to help maintain the temp in the livestock containers. Smaller containers can be in a cooler, and you can preheat the cooler with warm water or jugs of warm water. Dont start with a cold cooler.
