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You can "get by" on a gallon a day or less, but it is really not a good idea, even in winter.
Sounds like you have had good advice 1 gallon minimun winter or summer, winter is just colder desert (Key Word).
From Surprise valley I carried 43 liters of water in 1 liter bottles crammed into two daypacks tied together and a fanny pack.
It always comes out to 5 liters/quarts per day
No padding... no hip belt... 95+ pounds of water... with the bottles and packs it was probably right at 100 lbs.
I usually pack a MSR 10 liter Dromedary Bag, which empty weighs about 10 oz with its hydration hose. The bag seems "next to bullet proof," which is an important criteria for me.
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