>>9345187Not sure really - I did a fairly long marathon walk with only a one litre bottle of water to start with. Sure, I managed to top it up a few times wehen we passed (what looked like) crystal clear mountain streams, but I never had more than a litre of fluid available to rehydrate myself.
I'm pretty sure I didn't urinate for about 18 hours and when I did, it looked like freshly squeezed orange juice
I normally drink about four to 4½ litre of fluids per day and urinate about 0.7 litre five or six times per day.
To be honest, I am not happy "holding my bladder" as you put it - I would much rather empty it as soon as it starts to feel a bit "full".