For a week get a 5 day block wrapped in newspaper or butchers paper , put in bottom of esky and add a layer of party ice about 2 or 3 inches thick over and around the dry ice ,, any thing you want frozen stays on the bottom then add a layer off coolite over that to put things you dont want frozen onto the coolite ,,, remember though that dry ice takes up a LOT of room , when we used to use it for camping trips an 8 day block and the required party ice layer only left arount 15lt of space in a 70lt Bailys Esky , also works out rather expensive ,