You are totally right about this and seems that the OP is missing the fact that we are talking about something that happened over 2000 years ago. Back then there were no water treatment plants and water was heavily polluted People could not drink plain water because the water was filled with disease transmitting bacteria so they would use wine to kill the bacteria in the water in order to make it drinkeable. This practice is still used in poor areas of the middle east and what they do is mix one part wine into three parts of water. This mixture kills harmful bacteria and makes water safe for human consumption so the reason why the lack of wine is such a big issue is because if wine is over the mixture can’t be done therefore the water at the wedding is polluted. This is not about people getting drunk at a party. This is about a real necessity and that is why Mary asks Jesus for help. But more importantly, as other stated the circumstances surrounding the miracle are not the important thing here but the message of the story.
