Personally I have 5 x 1 litre bottles and 2 x 1/2 litre bottles so that I can constantly have cold water available.
[ ] Extra 1 litre water bottles. Personally I have 5 x 1 litre bottles and 2 x 1/2 litre bottles so that I can constantly have cold water available. I don’t find hot water particularly refreshing, or palatable, but that is what is provided as standard by the cook crew. So I have a bottle of cold water that I am drinking, a bottle that is cooling and a bottle that I have just filled with hot water. In addition I can then leave a water bottle at Camp 2 which will be there for when I go back again on the next rotation (as well as the one that I will carry down the hill with me and another few waiting for me at Base Camp). These are available in Kathmandu if you want to buy a few before the start of the expedition.