I tend to take a bottle for any run of an hour or longer. I just find my throat gets really dry and it makes breathing difficult. A personal preference. I will stop to fill up from a stream no problems, and actually prefer that water to the tapped stuff.
I did forget my water bottle doing the 2nd half FTOP last week, but at each water crossing, a few handfuls was enough to keep me lubricated. The spring as you go up Big End (hidden by the grass but audible as you climb) tastes particularly sweet!
My rule of thumb is clear and fast moving, with a check upstream as far as I can see to check there's nothing dead or nasty to make me poorly.







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