Depending on how long the sit is and distance depends on what we eat and take, we drive to our UK sits and to date have not managed any Overseas sits as yet.
If we are just a couple of nights and if it is close by, I grab a load of Meals that I have in the Freezer, when ever I cook, I always cook extra, if it doesn’t get eaten, I freeze it for a day that I just can’t cook at Home, a House sit or Hubby gets to live off them while the Kids and I are away on Housesits.
If it is a bit longer and not too far away, I will take as much as I can from home.
IE we are on a sit atm 10days, I had loads of fruit and veg still from Christmas and New Year, so I started with all that, then worked around what I can make with it all, roasts, soups, pasta sauces etc, so packed herbs and spices, just basic ones, pasta, rice, then flour, sugar, cereal, milk, bread/rolls/wraps, spread, I set the challenge for this sit to not go shopping only for bread as I knew we would run out and I’m nursing a torn knee ligament, awaiting surgery and in a bucket load of pain, so while i want us to eat healthy, i am keeping it all very simple atm, so I said to the Kids “we can drive to the closest petrol station and get fresh bread when we need it and that’s it, we are eating all this food” we are doing pretty good so far.
I use “too good to go” and “olio” quite a lot, especially when on a House sit, if we are away we use them quite a lot. We had a sit last year for 3 weeks and apart from our Vegan sub items like Nutritional Yeast (which I know you could go and buy it) we took those items, I took uncooked beans/pulses/pasta/rice they all go in zip lock bags and get packed around other items in the boot, we didn’t buy breads once, or Banana’s, actually most of our F&F, we got it all from within a 10min walk for the house we were staying at from Olio and at least 3 times a week we had meals from “too good to go” and some treats from Costa Coffee, I went to the supermarket once when we got there and got tinned tomatoes, tomato puree’s, spread, oil, s&p, seasonings and we lived off what we could pick up free from Olio or Too good to go, the Kids and I enjoyed the challenge and we agreed that If you lived in a built up area or a city, you could potentially live like this, though you might be eating a lot of bread items (lol)
Sometimes if it is a couple of nights, I will take spaghetti and beans and we have that on toast for dinner or soup with toast.
I understand the not wanting to have to cook it all then wash a heap of pots and pans, I suppose it also depends on what you like to eat and if you just want something simple or take some tinned vege/foods etc.
You could get a tin of white beans (don’t drain them, use the whole lot the aquafaba thickens to the soup beautifully) a tin of potatoes, a tin of mixed veg (sorry IDK if they exist) a tins of carrots and other veg’s (drain the liquid off them though) stock cubes, tin of tomatoes and small bag of pasta and make a minestrone type soup, you only need a shake of Italian style herbs (I’m sure the HO wouldn’t mind you using a little of whatever they have) some Garlic too and you have a one pot soup possibly 2-3 meals with some fresh bread.