Maybe some people will hate this idea, because it will complicate a bit more the game. BUT:
Water is a precious thing in our days. The NEW gold, the Blue Gold and it should be valorized and protected.
I sugest that the water can be collected somewhere and used in our limited irrigators and watering cans.
How to implement? Some simple way, here are the "maybes":
Maybe something frequent to be find, so frequent as the mail boxes. Maybe something as Water Wells spread around.
Maybe we wouldn't need them everywhere. Maybe we could have one in our houses, and maybe also one in each community garden.
This would be to fill and refill the irrigator and water can to use on our crops. But as one alternative possibility I was also thinking about recipients to storage the water at home and/or to sell, or trade, as any other thing, on the auctions, etc.
Finally I would like to clarify that this is not one attempt to mimic anything we have in RL (because some might understand as that) and rather both for the pleasure of playing (adding this feature - collecting water, etc), and to put more in evidence some vital resource for life as this. Each day more and more precious...
Think about it!
EDIT: "Thanks for telling me about the wonderful and mighty tinkertool. I know very well how to use a tinkertool. Do you too? Tinkertool repairs the tools, doesn't refill water (at least shouldn't)."
EDIT2: Nobody likes it so.... just forget about it! :)