8 to 12 pounds is not an unreasonable base weight for my self for any of the 3 seasons. I prioritize safety, warmth, and sleeping comfort. The way I deal with water in dry conditions are these 3 strategies.

-One I channel my inner camel and drink as much as I can at the source, this is usually around 1 L.
-Two always have enough salt in my diet salt is cultural to staying hydrated and retaining water.
-Three drink often, I hate coming to a water source with more than .5 l in the pack if I have a good set of maps and a good understanding of conditions, I will know where the next water source is. This is a skill like anything else and should be worked on slowly as water is life!

If I was dry camping I would add 3 L per full day(condition dependent) maybe not cook to save water use. Also start very early rest during the heat of the day, try not to over exert my self.

Cheers
Matt