I have read several times about your trip to Lake Powell, I'm planning a 5-6 days trip to the lake the next October. I read that you were with one 6 liter dromedary bag, according to I understood that lasted 7 days to you then you refilled your bag. What I would like to know is how much water I need to drink per day. I think that with 2 liters of water is sufficient per day but am not sure of that. Thanks again!!!