pee on the plants to show dominance

I would automatically assume they only mean indoor and/or potted plants, so that's all I'd water.

If you start early in the morning you can finish before dinner time.

We used to hire someone to take care of our horses and water the plants.. If you're doing it for free maybe you should reconsider haha

I highly doubt they meant water the fields. as someone who has lived on farms my whole life, no one does that unless they have an expensive crop and irrigation system. if there are plants inside, water those. the fields will be fine. on another note, as one commenter suggested letting the horses out to eat all the grass-don't do that, especially if they aren't eating much grass at the moment as a sudden change of diet can cause several serious health issues. anyway, best of luck with the ponies! :-)

Run a hose (out into the yard) from the window of every room where there is a tap and then flood the property. You only need to do this once. It'll keep everything hydrated till your sneaky neighbours return. That's all I got!

That's some shady shit from ur neighbors

Time to google "rain dance"

Solution: don't do it

They might have meant in the house only? Otherwise they would have said water the gardens.