How to batch-empty farm tiles from wrong irrigation?

Solution 1:

Unfortunately, there is no way to mass empty farm tiles. You could deconstruct and rebuild them, but this requires a lot more time and labour from your duplicants.

To remove the water bottles left behind after emptying them, you need a bottle emptier. Build the bottle emptier over a suitable area and your dupes will move them into it, emptying them into the space below. Sweeping the area with the bottles will force dupes to do this more quickly.

You can also select a bottle and select empty. This is faster but will cause dupes to empty the bottle where it is, leaving water on the floor.