Water Conservation

Question: Can the water from "Netilat Yadayim" be saved and used for watering the garden? If so, could it be saved on Shabbat for later use?
Answer: It is permissible to use it to water a garden. The Halachah does mention not stepping on the water after "Netilat Yadayim," but here the water is absorbed into the ground. It seems that saving the water from "Netilat Yadayim" on Shabbat is insignificant and there is no need.