I shop as an individual, apart from very occasional shared meals with my lodger. I maintain the house supply of spices, cooking oil etc, but all other food is bought individually. I spend about £30 - 40 per week, not including alcohol, which isn't much anyway. I pay for on average 1 cafe / pub / take away sandwich meal per week, which isn't incuded in the £30 - 40. Pub or cafe meal costs around £2.50 [post parkrun bacon butty & coffee at a cafe in south Leeds] - £10 [roast dinner, diet Coke & coffee at a cafe in Tynemouth]; takeaway sandwich meal costs around £3 - £4. I use budget supermarkets [Aldi, as no Lidl nearby] and know when food is reduced in price as it's shortdated - I either eat that day or day after or freeze immediately. As you're catering for 2 people, your costs should be less than double mine.