There's only DH, me, and the dog - we do like to eat well though. My weekly budget for the Tesco click 'n collect is 'under €100', which includes household stuff like washing up liquid, dishwasher tablets, washing machine things etc. etc. The dog food and treats alone come to around €25!
Once every few months (maybe three times a year?), I do online bulk orders for meat and fish for the freezer. Once a year we get a whole sheep, butchered, too. The weekly online shop is mostly veg, fruit, pulses, cereals, tea, coffee, yogurts, eggs, flour, herbs/spices and similar. I buy one pre-made lasagne a week for DH to have on his return from the pub on Friday - which is my homemade curry night (he's gone off curry).
I'm retired, so I have all the time in the world to cook from scratch, which I really enjoy. I'm not sure it keeps the costs down (DH jokes that I make the most expensive sausages in the world), but at least I know what's in what we're eating.
We're very lucky to be able to afford to eat this way - but then again, if we eat out once a year it's a miracle, and we never get takeaways/deliveries because they simply don't exist in our area. I also grow some veg - but not enough for us to live on, by a long chalk!