How to build your own passive hydroponics rig, with just some bottles, soil and cardboard. Full guide for growing your free food - http://red-dot-geek.com/easy-diy-hydroponics-beginners/
2 The Build
What You Need - Materials ⊙ Recycled plastic bottle (non toxic ones preferred). ⊙ Cheap cardboard. Waterproof. ⊙ Veggie scraps that you can re-grow. ⊙ Soil and LECA balls. ⊙ Some strings.