As of right now, I agree with O Negative on Pawns not having any more daily needs than eating or sleeping (bathroom needs come up often as well, in these threads).
Although, to touch on your idea, I think water for plants would be an interesting mechanic: they would need rain to enrich the soil every few days, and in the absence of rain you would need to dig wells to irrigate from groundwater or pull water from a river/ocean.
I also have been fond of the idea of incorporating bridges as good bottleneck points/ to access unreachable parts of water-heavy maps, or water mills as alternate power ideas, or fishing in the shallows.
Tl:dr I would actually like to see water play a more direct role in this game, but not as a consumable.
Although, to touch on your idea, I think water for plants would be an interesting mechanic: they would need rain to enrich the soil every few days, and in the absence of rain you would need to dig wells to irrigate from groundwater or pull water from a river/ocean.
I also have been fond of the idea of incorporating bridges as good bottleneck points/ to access unreachable parts of water-heavy maps, or water mills as alternate power ideas, or fishing in the shallows.
Tl:dr I would actually like to see water play a more direct role in this game, but not as a consumable.