I'm pretty comfortable with my technique to stay hydrated, but I am curious about estimating how much liquid is actually involved. I generally am just concerned with getting rid of it, but occasionally (especially when drips become a steady trickle) I wonder at how much I can make.
I guess if I weighed the easier outputs and inputs and did calorie math to account for my breath I could get something, but that sounds like a lot of (unappealing) work.
Weighing clothes twice might give me a lower bound, but working in plastic wrap (to avoid drip and evaporation loses) isn't pleasant.
Is there a casual way to estimate sweat? Preferably usable in the field with minimal prep-work.