We strongly oppose the use of plastic mineral water bottles for environmental concerns. Instead, Mountain Monarch staff carries kerosene to provide you with appropriately boiled water every morning and evening without any additional charge. We suggest you bring at least 2 metal or plastic Nalgene bottles so that you can have enough to last the duration of the day. Besides you can use the hot bottles at night as a hot pack in your sleeping bag and can still drink it during the day when it's still warm.