public Fanta(int id)
 {
     Type         = "fanta";
     Promitheutis = Promitheutis.Promitheutiki;
     Id           = id;
 }
 public Water(int id)
 {
     Type         = "water";
     Promitheutis = Promitheutis.Karamitros_AE;
     Id           = id;
 }
 public CocaCola(int id)
 {
     Type         = "CocaCola";
     Promitheutis = Promitheutis.AthinaikiKava;
     Id           = id;
 }