As someone who lived in London for nearly a decade, getting groceries was 100x easier than when I lived somewhere you had to drive for 15-30 minutes (traffic) to get to a large hypermarket.
A rucksack will easily carry around 5-6 days of food. Other than that, I would simply pop by the shop on my commute home from work. It would be a 5-10 minute detour max.
Remember that the shops in such cities are directly accessible (no need to walk through a massive shopping centre), there's no time wasted on finding a parking space, there's so many shops that it's extremely likely that there's at least one between your home and the bus/tube stop and they're mostly exclusively filled with food so you're not walking past dozens of aisles filled with non-groceries.
The big bonus of course is that if you wake up in the morning and realise you're out of milk, it's a usually a <5min walk to the closest shop to pick some up and no one will bat an eyelid if you're still wearing your bathing gown. :)
There's also generally less food waste (as you shop for fewer days and can plan better) and you can opt into buying your fruit, veg, meat and fish fresh every day instead of having to hope that your 'big shop' at the megastore will still be fresh at the end of the week.
A rucksack will easily carry around 5-6 days of food. Other than that, I would simply pop by the shop on my commute home from work. It would be a 5-10 minute detour max.
Remember that the shops in such cities are directly accessible (no need to walk through a massive shopping centre), there's no time wasted on finding a parking space, there's so many shops that it's extremely likely that there's at least one between your home and the bus/tube stop and they're mostly exclusively filled with food so you're not walking past dozens of aisles filled with non-groceries.
The big bonus of course is that if you wake up in the morning and realise you're out of milk, it's a usually a <5min walk to the closest shop to pick some up and no one will bat an eyelid if you're still wearing your bathing gown. :)
There's also generally less food waste (as you shop for fewer days and can plan better) and you can opt into buying your fruit, veg, meat and fish fresh every day instead of having to hope that your 'big shop' at the megastore will still be fresh at the end of the week.