If Jesus can turn water into wine, but wine is still mostly made of water, can Jesus apply his powers recursively and create more and more concentrated wine?
It was a way to say that the love/companionship of Christ was all you needed. You had Jesus, so water was as good a drink as wine could ever be. Five loaves of bread and two fish split amongst 5,000 was enough to satisfy their hunger, because all they needed was a morsel with Christ by their side.