The majority of the time, i have sufficient water to last the duration of my walks, and its been a very rare occurrence for me to run out of water.
The last time it happened, was back in 2016 i think, when i was enjoying a savagely hot Cwm Caseg jaunt.
I went through the 5 Litres of water in my measured Camelbak bladders, and still ran out of juice, llyn Caseg below Yr Elen, saved the day.
Its very rare for me to run out of water, as certain severe hydration episodes in the distant past, has taught me a lesson.
Take too much water with you, and if its too much, at least you can bring it home with you to water the plants.
Take to little, and then there's that anxious search for a clean water supply.
No point in remonstrating with Mrs Sheep, bleating away, telling you her hubby lies dead, face down in the water further up the valley.