把矿泉水先放在冰冻层冻成冰，放在cooler内作冰块
People like to drink the water after the ice melt. DON'T drink the water if you use plastic bottles. The sub-zero temperature in the freezer will cause plastic bottles to release some harmful chemicals and mix with the water.
夏天露营5要诀：分享一下我的露营经验