Sable flies in circles, holding her bottomless bucket.

She actually doesn't pour water directly out of the bucket - it appears some distance below her, one 2' x 2' x 2' cube at a time, and splashes onto the wasteland from there. (She does not drop any on the plant woman, because she's nice.)

When patches of wasteland have had a moment to appreciate their newfound dampness, she bestows grass upon them with a Staff of Regrowth.