Looking through the rules, while food rationing and gathering are covered, the rules for water, as I found them, were more sparse.
You start with (generally) D6 water rations, each day of water weighs 1/2, and you need to consume 1 ration/day or risk the deadly and rapid onset of the dehydration condition. All good there.
Then to gather water (outside of finding a well or trading), you can Forage. When foraging for water, success means that you find enough drinkable water to fill your water bottles. But what does that actually mean?? What is the water capacity each person carries? What about animals? Vehicles? If the party finds clean water, how many day-rations will this equate to?
Have I missed something in the rules? Alternatively, how are other GMs handling this?