Online Grocery Delivery to Holiday Cottage

Hello gransnetters How do I organise a grocery delivery to the holiday cottage we’ll be staying at for a week. I hope you will be able to give advice as I need to know if it’s possible and if so how do I organise it?
I feel a bit silly that at my age I don’t know! I have a Sainsbury’s grocery delivery to my home, which will be some 200miles away from the holiday cottage, so I have got my head around that it’s how to contact the nearest supermarket to the holiday cottage for a delivery.
You may suggest taking what food we need and/or eating out - both quite reasonable however it’s me (76yr old) as front seat passenger and my granddaughter driving. The back seat will be occupied by her two dogs.
Without going into details the boot will be full and very little room to carry groceries.