the sun is getting low, and you're looking at spending a night in a canyon where the temps may drop into the 30s or 40s. Your priority needs to change from water to shelter.
Just because it gets dark does not mean you are spendng the night in the wilderness. That is why it is a good idea to carry a headlamp and extra clothes. If it gets dark; you use the headlamp (if you know where you are going) it gets cold and you add layers.
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