I feel water bags and wells are just so underused and pointless I figured I'd think of something....
In order to travel on foot, you will require water. Every two squares distance (Going straight "left to right") will use up a water bag. So lets say you need to travel 10 squares, you will require 5 water bags or more.
Now, in order to keep this from being TOO harsh, as I know it is indeed very very harsh....
Travelling will not necessarily "REQUIRE" you to have water bags to keep moving. However there will be a consequence. The effect would be a temporary Damage to Maximum Healthpoints and maybe other effects such as lower Strength and PE.
In order to get rid of this, you must drink water, but drinking whatever for each square you didn't have water, will only relieve you of half the negative effect it cause. In order to FULLY be rid of the dehydration effects, you must visit a doctor, saying something along the lines of feeling really weak and sick. The Doctor will say you've had a Dehydration stroke or Heat Stroke and it'll cost x amount of caps to treat it depending on your level.
(The reasoning behind this is that heat strokes and dehydration strokes have long-lasting health risks if left untreated, so a doctor in such an advanced time-period of technology would probably be able to treat you.)
With 150% Doctor skill, and a Auto-Doc (Which could be bought as an accessory to bases, thats my idea anyway) you can treat yourself. ( and maybe by using the auto-doc, treat others.) But only at bases.
Update1:
BTW I forgot to add this in original post, but you should be able to refill your water bags in those rare encounters with water in them. But that water will be radiated. only Half of positive effects and you will be radiated by it.
Update2: I forgot to mention cars. Cars would work the same, they would just be faster so you would require less water.