I think, "the big bottle" is a good idea because young people can enjoy the party drinking and meeting people without wasting much money. In this kind of parties you make many friends. It is not necessery to drink alcohol to go to "the big bottle", you can dance or talk unless you want to drink spirits.
To sum up, "the big bottle" is a good ide, because teenagers can enjoy with their friends, but I think people should be cleaner. I also think that teenagers under fourteen or fifteen years shouldn't drink alcoholic drinks in "big bottles"