How often, strolling around the city, the countryside or the beach, do you happen to see plastic bottles left on the ground? Have you ever been caught by a sudden thirst while you were away from home and you had to buy a (too expensive) drink in a pub or bar? Then I imagine you threw the bottle or can (in a trash bin, hopefully) immediately after its first, and only use. Or again, how many times have you forgotten a bottle of water in the car, hit by the sun, and you noticed that it had changed its flavor? Every time I leave home, I bring something to drink…