Pro tip.
Time how long you take to empty your bladder in a jug at home, and then at work just time how long you piss for. You can then calculate and adjust your water requirements accordingly.
how do I know how full my bladder is, do I wait until Im bursting or do I have to estimate from the time I first feel the need to go, also sometimes when I really need to piss I might push it out in blast then let it taper off, or alternatively I may pinch the tip slightly and savour the enjoyment of the release of the piss
I sense its all too much for me, I will just go off the mirror I think (and I dont mean piss on the mirror)