I think one of the issues that I have is the idea of "knowing" how much water you will need, and tying into that amount. I am reknowned for how little I eat and drink (always been this way) but one time I was not feeling well, so I guzzled 2litres in a very short distance. I needed this water, and soon after, I felt fine.
Whether you dip & sip or filter, be sure to leave your options open to take in as much water as you may need at the moment.
BTW, I have filtered and not filtered during trips (some areas have huge livestock presence) and with a little practice, filtering took minutes (really, doncha want to stop and rest a few times during the trip??)
