We never have milk in the house because my wife doesn’t drink it and I am allergic. I go to Costco and get the long-life soy milk cartons, it’s 10 or 12 cartons for under $10. Much cheaper than at the local supermarket. I also make my own goat milk yoghurt.

As to the comment on soda or soft drinks, buying the two litre leads to waste in our house as it goes flat before it’s half way finished. So we get cases of cans. Not that we drink it very often, as it is high in HFCS.