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HiThank youYou can find same films on your country:https://www.google.hu/search?biw=1918&bih=939&tbm=isch&sa=1&q=hand+stretch+film&oq=hand+Stretch+Film&gs_l=psy-ab.3.0.0i19k1l2j0i7i30i19k1.9212.9898.0.12305.5.5.0.0.0.0.96.4220.127.116.11....0...1.1.64.psy-ab..0.5.424...0i13k1j0i7i30k1j0i8i7i30k1j0i8i7i30i19k1.0.aEyLBEe8vm4
Yes, just the two foil stick together. No need glue, screw, nail, rope etc. Just adhesive tape.
Stretch Film Greenhouse (Or...View Instructable »
I dont said aluminium :)
Yes this is an industrial material. You can find same strong foils in an workshop where made Truck tilt or tents.Or you should find any strong material in your territory.You can use strong but not waterproof material too, then you cotton inside with waterproof normal foil. The can go inside the soil.
This gray one, is PVC coated textil.
Here is the system. All parts from Aliexpress. the water pump about 12 USD. At beginning must perfect set up the dropping, then goes automatic with an timer switch. https://youtu.be/Xu0DqCwKKi4
Modular Vertical Garden.View Instructable »