The main components are:
1) a tank 25 liters (of a certain ruggedness)
2) a small compressor for inflating bicycle tires
3) irrigation hose
4) rigid tube (recovered from an old electrical equipment from outside)
5) a few meters of flexible tube with a diameter of about 5 mm.
6) hot glue
7) other little accessory material
In this first project I dealt with irrigation of my tomatoes; I'll hope afterwards, by explaining it with another instructable, irrigation of the rest of the seedlings of my vegetable garden.
However already in this realization are the main components of the next.