thanks everyone!!
the problem with grey water is that its not my house, its my parents house.
1. so, im thinking about half buried half raized hugulkultur, i can't dig really deep there.
i have accses to : hay and cow manure (dairy farm) , i could find wood, and garden waste.
2. wicking beds looks cool, i think i won't put the plastic sheet under the soil, the buried wood will help not loosing the water right?
3. you guys think i should try the underground watering pipe like in wicking beds? is it to keep the water from evaporating? will it be effective without the plastic under the soil?
4. how to start finding out what to plant?