^^^^^Why not stay home and self isolate, you have already stock piled a good 2 week supply. This is what you bought it all for, so you don't have to go to the shop every day, otherwise the stockpiling is just a waste of time ? And contributed to the reason why these restriction have had to come in the first place, to be fair for all Aussies.
If you are too worried about the chance of getting it if you go buy milk, don't buy milk, I guess for you the choice is can I live without it or risk your families life.
I don't think going to the corner store for some milk is that life and death, but if thats where your at, don't go, you wont die if you don't have milk in your latte